Pet accidents, muddy paw prints, food spills, stained upholstery, and dirty car seats do not always require a full-size carpet cleaner. The three BISSELL Little Green machines below are portable carpet and upholstery spot cleaners designed for focused cleaning on manufacturer-approved soft surfaces. Choose the Little Green Pet Pro 3909 for larger tanks and the broadest tool package, the Little Green Max Pet SmartMix 38572 for automatic formula mixing, or the Little Green Max Pet 3860 for a lightweight machine with a conventional fill process.
Last reviewed: August 3, 2026 — model specifications, manufacturer claims, surface guidance, accessories, and warranty wording were reviewed.
Affiliate disclosure: As an Amazon Associate, we may earn from qualifying purchases at no extra cost to you.
Quick Verdict
- Best Overall and Best for Larger Jobs: BISSELL Little Green Pet Pro 3909
- Best for Automatic Formula Mixing: BISSELL Little Green Max Pet SmartMix 38572
- Best Lightweight Simple Option: BISSELL Little Green Max Pet 3860
BISSELL Little Green Quick Comparison
| Model | Best For | Weight | Tank Capacity | Standout Feature | Amazon |
|---|---|---|---|---|---|
| Little Green Pet Pro 3909 | Frequent pet messes and longer cleaning sessions | 11 lb | 64 oz clean / 48 oz dirty | Largest tanks and three included tools | Check Product Details |
| Max Pet SmartMix 38572 | No-measure formula preparation and quick spot cleaning | 8.2 lb | 32 oz clean / 32 oz dirty | Automatic SmartMix formula system | Check Product Details |
| Max Pet 3860 | Buyers who want a lighter machine with simple controls | 8.2 lb | 32 oz clean / 32 oz dirty | Traditional fill process and self-cleaning stain tool | Check Product Details |
How we compared these cleaners: Model names, tank sizes, weights, tools, manufacturer suction claims, and other specifications were checked against the official BISSELL information for model 3909, model 38572, and model 3860. Accessories, formulas, colors, warranty terms, and packaging can vary by seller or retailer bundle, so confirm the current Amazon listing before ordering.
BISSELL Little Green Pet Pro Portable Carpet Cleaner 3909
Best Overall and Best for Larger Jobs
The BISSELL Little Green Pet Pro 3909 is the most practical choice here for homes that regularly deal with pet accidents, tracked-in dirt, stained upholstery, dirty stairs, or several cleaning areas during one session. Its main advantage is capacity: the 64-ounce clean-water tank and 48-ounce dirty-water tank can reduce how often you must stop to refill or empty the machine.
BISSELL describes the 3909 as providing its strongest suction versus leading competing portable deep cleaners based on an ASTM F558 sealed-suction comparison at the hose. This is a manufacturer test under stated conditions, not proof that the 3909 outperforms every portable cleaner or will completely remove every stain.
The current BISSELL configuration includes a five-foot hose, 15-foot power cord, Self-Cleaning Tough Stain Tool, Pet Hair Removal Tool, and Spraying Crevice Tool. The crevice attachment is especially useful around cushion seams, vehicle-seat edges, and other narrow areas that are difficult to reach with a standard stain tool.
- Model: 3909
- Weight: 11 pounds
- Clean-water capacity: 64 ounces
- Dirty-water capacity: 48 ounces
- Hose length: 5 feet
- Power-cord length: 15 feet
- Included tools: Self-Cleaning Tough Stain Tool, Pet Hair Removal Tool, and Spraying Crevice Tool
- Suitable surfaces: Manufacturer-approved carpet, area rugs, stairs, pet beds, auto interiors, and upholstery that allow water-based cleaning
Why You’ll Like It: The larger tanks reduce interruptions, while the three-tool package covers ordinary spots, embedded pet hair, upholstery seams, and narrow vehicle areas. It offers the most versatile setup of the three for frequent use.
Who Should Buy It: Pet owners who expect to clean several stains, furniture pieces, stairs, rugs, or vehicle surfaces during one session.
Who Should Avoid It: Buyers who only treat an occasional small spill and want the lightest machine possible. At 11 pounds before water and formula are added, it is heavier than both Max Pet models.
Pros:
- Largest clean- and dirty-water tanks in this comparison
- Three useful tools for spots, pet hair, seams, and narrow spaces
- Five-foot hose and 15-foot cord provide useful working reach
- Self-cleaning stain tool helps flush residue from the tool and hose
Cons:
- Heavier than the two 8.2-pound Max Pet models
- Corded design requires access to an electrical outlet
- Larger-capacity body may require more storage room
BISSELL Little Green Max Pet SmartMix Deep Cleaner 38572
Best for Automatic Formula Mixing
The BISSELL Little Green Max Pet SmartMix 38572 is the better choice for buyers who want to avoid manually measuring cleaning formula for each tank. Its SmartMix system automatically combines formula and water, while the control lets you select a water-only Rinse Mode or a formula-and-water Max Clean Mode.
At 8.2 pounds before filling, it is easier to carry between rooms or out to a vehicle than the 3909. Its 32-ounce clean-water and 32-ounce dirty-water tanks are well suited to focused spot cleaning on carpet, upholstery, stairs, pet beds, rugs, and vehicle interiors, although larger jobs will require more frequent filling and emptying.
BISSELL states that the 38572 produces 30% more powerful suction than the selected Shark StainStriker and Dirt Devil Compact Spot Cleaner models used in its ASTM F558 average peak air-power comparison. This is a specific manufacturer comparison under stated conditions, not an independent comparison with every portable carpet cleaner.
- Model: 38572
- Weight: 8.2 pounds
- Clean-water capacity: 32 ounces
- Dirty-water capacity: 32 ounces
- Mixing system: SmartMix automatic formula mixing
- Cleaning settings: Water-only Rinse Mode and formula-based Max Clean Mode
- Included specialty tools: Self-Cleaning Tough Stain Tool and Pet Hair Removal Tool in the linked configuration; verify the current Amazon bundle
- Suitable surfaces: Manufacturer-approved carpet, area rugs, stairs, pet beds, auto interiors, and upholstery that allow water-based cleaning
Capacity clarification: BISSELL lists both the clean-water and dirty-water tanks at 32 ounces. A smaller ounce figure in a retailer bundle may refer to an included trial bottle of cleaning formula rather than the machine’s tank capacity.
Why You’ll Like It: SmartMix removes much of the guesswork from solution preparation. The separate rinse setting is also useful when you want to make an additional water-only extraction pass after cleaning a stain.
Who Should Buy It: Buyers who value automatic formula preparation, a lower carrying weight, and separate cleaning and rinse settings.
Who Should Avoid It: Anyone planning to clean several large areas at once. Its 32-ounce tanks require more frequent attention than the larger tanks on the 3909.
Pros:
- SmartMix automatically combines formula and water
- Water-only Rinse Mode and Max Clean Mode provide useful control
- Lightweight 8.2-pound body is easier to carry and store
- Designed for focused cleaning on carpet, upholstery, stairs, rugs, pet beds, and vehicle interiors
Cons:
- Smaller tanks than the Pet Pro 3909
- Corded operation still requires a nearby outlet
- SmartMix adds controls that occasional users may not need
- Exact tools and formula bottle can vary by retailer bundle
BISSELL Little Green Max Pet Portable Deep Cleaner 3860
Best Lightweight Simple Option
The BISSELL Little Green Max Pet 3860 offers similar portable spot-cleaning capability to the SmartMix version but uses a conventional fill process. You add warm tap water and a compatible portable-cleaner formula according to the tank markings instead of relying on an automatic mixing system.
Its 8.2-pound body, 4.8-foot hose, and 15-foot power cord make it easy to move between carpet spots, stairs, furniture, pet beds, rugs, and vehicle interiors. Separate 32-ounce clean-water and dirty-water tanks keep recovered liquid apart from the fresh cleaning solution.
BISSELL states that this model provides 30% more powerful suction than the Shark StainStriker used in its stated manufacturer comparison. This claim applies to the identified test conditions and should not be interpreted as proof that the machine outperforms every portable cleaner or removes every stain.
- Model: 3860
- Weight: 8.2 pounds
- Clean-water capacity: 32 ounces
- Dirty-water capacity: 32 ounces
- Hose length: 4.8 feet
- Power-cord length: 15 feet
- Included tools: Self-Cleaning Tough Stain Tool and Specialized Pet Hair Removal Tool in the linked configuration; verify the current Amazon bundle
- Suitable surfaces: Manufacturer-approved carpet, rugs, stairs, pet beds, auto interiors, and upholstery that allow water-based cleaning
Why You’ll Like It: The 3860 provides the core features many pet owners need without the larger body of the Pet Pro or the additional SmartMix controls of the 38572.
Who Should Buy It: Buyers who want a lightweight portable carpet and upholstery cleaner with simple controls, separate tanks, a pet hair tool, and a self-cleaning stain attachment.
Who Should Avoid It: Buyers who dislike measuring formula or expect to clean several large areas in one session. The Pet Pro 3909 is better suited to longer jobs, while the 38572 is more convenient for automatic mixing.
Pros:
- Lightweight and relatively compact
- 15-foot cord and 4.8-foot hose provide useful spot-cleaning reach
- Separate clean- and dirty-water tanks
- Includes stain-cleaning and pet-hair tools in the linked configuration
Cons:
- Requires manual water and formula preparation
- Smaller tanks than the Pet Pro 3909
- No dedicated SmartMix water-only rinse mode
- Exact package contents can vary by seller or bundle
Factors to Consider When Choosing a BISSELL Little Green Pet Cleaner
These three portable carpet and upholstery cleaners handle similar types of household messes, but their tank sizes, weights, tools, and formula systems suit different cleaning routines. Compare the following factors before choosing.
Tank Capacity and Job Size
The Pet Pro 3909 is the clear choice for longer sessions because it has a 64-ounce clean-water tank and a 48-ounce dirty-water tank. That additional capacity can reduce interruptions when cleaning several couch cushions, carpet spots, stairs, rugs, or vehicle seats.
The 3860 and 38572 each use 32-ounce clean-water and dirty-water tanks. Their smaller tanks help keep the machines lighter and easier to carry, but they are better suited to focused spot and upholstery cleaning than to large wall-to-wall carpet jobs.
SmartMix Versus Manual Mixing
Model 38572 automatically combines cleaning formula and water through its SmartMix system. It also lets you choose between a water-only Rinse Mode and a formula-based Max Clean Mode.
Models 3860 and 3909 use conventional fill instructions. You must follow the tank markings and formula directions, but the simpler setup may appeal to buyers who do not need an automatic mixing system.
Understanding the Suction Claims
BISSELL uses ASTM F558 procedures to compare these machines with selected competing portable cleaners. The “30% more powerful” and “strongest suction” statements are manufacturer comparisons under specific test conditions. They should not be treated as independent proof that the machines outperform every portable cleaner or as guarantees that every stain will disappear.
Real-world extraction also depends on the material, stain type, age of the spill, cleaning formula, amount of solution applied, and number of slow suction-only passes.
Weight, Mobility, and Reach
The two Max Pet models weigh 8.2 pounds before water and formula are added, making them easier to carry up stairs or into a vehicle. The Pet Pro 3909 weighs 11 pounds but provides larger tanks and an additional specialized tool.
Models 3860 and 3909 both have 15-foot cords. The 3860 has a 4.8-foot hose, while the 3909 has a five-foot hose. Confirm the exact cord, hose, and accessory specifications shown in the current retailer listing for model 38572.
Included Cleaning Tools
A stain tool is useful for ordinary carpet spots and upholstery. A pet hair attachment can help loosen or collect embedded fur. A spraying crevice tool is useful around cushion edges, vehicle-seat seams, and other tight areas.
The Pet Pro 3909 offers the broadest listed tool package in this comparison. The exact accessories included with any machine can vary by retailer or promotional bundle, so verify the package contents instead of relying only on the product-family name.
Surface Compatibility and Care Codes
These machines are intended for manufacturer-approved soft surfaces such as carpet, area rugs, stairs, upholstery, pet beds, and vehicle interiors. They are not automatically safe for every fabric, rug, cushion, or vehicle-seat material.
Compatibility warning: Check the carpet, rug, furniture, or vehicle-upholstery care instructions before using a wet extractor. Upholstery marked “W” or “WS” generally allows water-based cleaning, but always follow the material manufacturer’s instructions. Do not wet-clean materials marked “S” or “X” unless their manufacturer specifically permits it. Test a hidden area for colorfastness before cleaning a visible section.
Formula and Water
Use a BISSELL formula labeled for portable carpet cleaners and follow the fill instructions for the exact model. Use warm tap water when directed, not boiling water. Excessively hot water can damage plastic tank components.
Do not assume that a Little Green portable cleaner contains an internal water heater. SmartMix controls formula mixing; it does not mean that the machine heats the water.
These machines also do not replace a dry vacuum. Remove loose dirt, crumbs, and as much pet hair as practical before wet cleaning so debris does not accumulate in the cleaning tool or hose.
Cleaning Technique and Drying Time
Blot up excess liquid before extraction. Apply only enough solution to treat the area, scrub as directed, and then make several slow passes with the spray trigger released to recover as much moisture as possible.
Avoid repeatedly soaking the same area. Open windows, run ventilation, or use fans when appropriate so carpet and upholstery can dry fully. Drying time depends on how much liquid was applied, the material, room temperature, airflow, and humidity.
Cleaning and Maintenance
After each use, empty and rinse the dirty-water tank, rinse the cleaning tool, and use the model’s self-cleaning or hose-cleaning function when available. Check the tool opening, removable brush components, and the area beneath the dirty tank for trapped hair or debris.
Allow the tanks, lids, tools, and removable components to dry before reassembly and storage. Regular cleaning helps reduce odors, clogs, residue buildup, and loss of suction.
Warranty and Seller
BISSELL currently lists three-year limited warranty coverage for the U.S. versions of models 3860 and 3909. Coverage generally applies to the original purchaser, requires proof of purchase, and remains subject to the manufacturer’s terms and exclusions.
Confirm the warranty displayed for the exact model, seller, bundle, and country before ordering, especially for model 38572. Keep the receipt and register the cleaner after purchase where applicable.
Before You Buy Checklist
- Choose the 3909 if larger tanks and three specialized tools matter most.
- Choose the 38572 if automatic formula mixing is your top priority.
- Choose the 3860 if you want a lightweight cleaner with simple controls.
- Confirm that your carpet, rug, upholstery, or vehicle material allows water-based extraction.
- Check the exact tools, formula bottle, color, and package contents in the retailer bundle.
- Compare the filled carrying weight, not only the empty machine weight.
- Plan for access to an electrical outlet and enough drying time after cleaning.
- Remember that these are portable spot and upholstery cleaners, not full-width upright carpet cleaners.
Frequently Asked Questions
How Often Should I Use a BISSELL Little Green Cleaner?
Use it when a spill, pet accident, muddy mark, or visibly soiled area needs treatment. There is no universal monthly schedule for a portable spot cleaner. Prompt treatment is generally more useful than waiting for a stain to dry, but avoid repeatedly saturating the same area.
Can It Remove Red Wine and Pet Accidents?
These cleaners are designed to treat many common food, drink, dirt, and pet stains on compatible materials. Results vary based on the stain, surface, age of the spill, formula, and cleaning method. Blot excess liquid first, follow the formula instructions, and test a hidden area before treating a visible section.
Is It Suitable for Every Carpet or Upholstery Type?
No portable wet extractor should be assumed safe for every material. Check the manufacturer’s care label and cleaning instructions. Test for colorfastness in an inconspicuous area, particularly on delicate rugs, natural fibers, dyed fabrics, vintage upholstery, and vehicle-seat materials.
What Maintenance Do BISSELL Little Green Cleaners Require?
Empty and rinse the dirty-water tank after use. Rinse the attachment, remove trapped hair or debris, clean the hose using the supplied self-cleaning feature or model-specific instructions, and wipe beneath the dirty tank when needed. Let removable components dry before storing the machine.
Do These Cleaners Include a Warranty?
BISSELL currently lists three-year limited warranties for U.S. models 3860 and 3909. The exact warranty term and conditions can vary by model, country, bundle, and seller. Review the warranty associated with the exact product listing, retain the original receipt, and register the machine where applicable.
Do These Cleaners Heat the Water?
Do not assume that a Little Green cleaner contains an internal water heater. Follow the instructions for the exact model and fill it with warm tap water when directed. Do not use boiling water, which can damage the tank or other components.
Can a Little Green Cleaner Clean an Entire Room?
It can treat multiple spots, but its narrow hand tool and portable tanks make it slower than a full-size upright carpet cleaner for wall-to-wall cleaning. The Little Green line is better suited to focused stains, stairs, upholstery, pet beds, rugs, and vehicle interiors.
Should I Vacuum Before Using a Little Green Cleaner?
Yes. Remove loose dirt, crumbs, and pet hair with a dry vacuum before applying cleaning solution. Pre-vacuuming helps keep debris out of the wet-cleaning tool and hose and allows the extractor to focus on stains and embedded soil.
How Do I Avoid Leaving Carpet or Upholstery Too Wet?
Avoid applying more solution than necessary. After spraying and scrubbing, release the trigger and make several slow suction-only passes. Improve ventilation and allow the material to dry fully before regular use.
Conclusion
The BISSELL Little Green Pet Pro 3909 is the best overall choice for frequent pet messes and longer cleaning sessions because its larger tanks and three-tool package reduce interruptions and cover more cleaning situations. Its main tradeoffs are its higher empty weight and larger body.
Choose the Little Green Max Pet SmartMix 38572 when automatic formula mixing and a dedicated water-only rinse setting are more useful than maximum tank capacity. Choose the Little Green Max Pet 3860 when you prefer an 8.2-pound machine with simpler controls and do not mind measuring the cleaning solution yourself.
Final Recommendation
For most pet owners comparing these three portable carpet and upholstery cleaners, start with the Pet Pro 3909 when tank capacity and tool versatility matter most. Pick the 38572 SmartMix for the easiest formula setup and a dedicated rinse setting, or choose the 3860 for a lighter, simpler spot-cleaning machine.
