If you are comparing the best BISSELL Little Green portable carpet cleaners for 2026, start with the messes you clean most often. The Little Green HydroSteam Pet 3618 is the most versatile because it adds steam and approved multi-surface cleaning. The Little Green Pet Pro 3909 is better for frequent pet messes and larger spot-cleaning jobs because it combines strong suction with larger tanks. The Little Green Max Pet SmartMix 38572 is the easiest to carry and simplifies formula mixing. All three are corded portable spot cleaners for compatible carpets, upholstery, stairs, pet beds, and vehicle fabrics, but only the 3618 produces steam.
Affiliate disclosure: This article contains affiliate links. We may earn a commission from qualifying purchases at no additional cost to you. Product bundles, specifications, warranties, and availability can change, so confirm the exact model and included tools on Amazon before ordering.
How we compared these cleaners: We focused on cleaning method, tank capacity, empty weight, hose and cord reach, included tools, compatible surfaces, maintenance needs, and the type of buyer each model suits. This is a specification- and use-case comparison, not a claim of hands-on laboratory testing.
Quick Verdict
- Best Overall / Premium Pick: Choose the BISSELL Little Green HydroSteam Pet 3618 when you want steam, three cleaning modes, and the widest surface versatility.
- Best for Strong Suction and Larger Jobs: Choose the BISSELL Little Green Pet Pro 3909 when larger tanks and pet-focused tools matter more than steam.
- Best Lightweight Pick: Choose the BISSELL Little Green Max Pet SmartMix 38572 when you want an 8.2-pound machine with automatic formula mixing and a rinse mode.
BISSELL Little Green Quick Comparison
| Model | Best For | Steam | Clean / Dirty Tank | Empty Weight | Main Trade-Off | Amazon |
|---|---|---|---|---|---|---|
| Little Green HydroSteam Pet 3618 | Steam cleaning and multi-surface versatility | Yes, with three modes | 64 oz / 51 oz | 13 lb | Heaviest option; steam adds extra steps | Check Amazon |
| Little Green Pet Pro 3909 | Strong suction, larger tanks, and pet tools | No | 64 oz / 48 oz | 11 lb | No steam; larger than the SmartMix model | Check Amazon |
| Little Green Max Pet SmartMix 38572 | Lightweight cleaning and automatic solution mixing | No | 32 oz / 32 oz | 8.2 lb | Smallest tanks and no steam | Check Amazon |
Specification note: Figures above refer to the reviewed models. Retailer bundles and included attachments can differ, so verify the model number and package contents before purchase.
BISSELL Little Green HydroSteam Pet Portable Carpet Cleaner (3618)
The BISSELL Little Green HydroSteam Pet Portable Carpet Cleaner 3618 is the strongest fit for buyers who want more than a standard spray-and-extract spot cleaner. Its HydroSteam Technology combines steam, cleaning solution, and suction, while three cleaning modes let you adjust the machine for different messes.
SteamWash Mode is intended for sticky and oily stains, Steam Mode can refresh compatible upholstery and clean approved hard surfaces with the correct tool, and Wash Mode handles spills and common pet stains. BISSELL states that SteamWash can improve cleaning of tough, oily stains by up to 50% compared with its stated test method. This is a stain- and mode-specific claim rather than a guarantee that every mess will clean 50% better.
The 3618 has a 64-ounce clean tank, a separate 51-ounce dirty tank, a 4.8-foot hose, and a 15-foot power cord. It weighs approximately 13 pounds empty. The reviewed configuration includes a 5-inch Tough Stain Tool and a Multi-Surface Tool. In Steam Mode, BISSELL says compatible upholstery may dry in about 25 minutes when tested on new polyester, although fabric, airflow, solution use, and extraction technique can change the actual drying time.
Best For: Buyers who want steam-assisted stain cleaning, three cleaning modes, and the ability to clean compatible soft surfaces plus approved tile, grout, and other surfaces with the proper attachment.
Why You’ll Like It:
- It is the only true HydroSteam cleaner in this comparison.
- Three modes make it easier to match the cleaning action to the type of mess.
- The 64-ounce clean tank supports longer spot-cleaning sessions.
- The Multi-Surface Tool expands its usefulness beyond carpets and upholstery.
Who Should Avoid It:
- Buyers who only need a simple extractor for occasional fresh spills.
- Anyone who prefers the lightest and most compact option.
- People who do not need steam and would rather choose a less complex machine.
Pros:
- SteamWash, Steam, and Wash cleaning modes.
- Steam-assisted cleaning for compatible surfaces and difficult oily messes.
- Separate clean and dirty water tanks.
- Includes tools for stains and approved multi-surface cleaning.
Cons:
- Heavier than the 8.2-pound Max Pet SmartMix.
- Steam is not appropriate for every fabric or surface.
- More features may be unnecessary for basic spill cleanup.
Surface safety note: Check upholstery and carpet care instructions before wet cleaning or steaming. Test a hidden area first. Do not use steam on leather, delicate natural fibers, unsealed surfaces, heat-sensitive materials, or any item whose manufacturer prohibits steam or water-based cleaning.
BISSELL Little Green Pet Pro Portable Carpet Cleaner (3909)
The BISSELL Little Green Pet Pro 3909 is designed for buyers dealing with frequent pet stains, embedded hair, dirty upholstery, and vehicle-interior messes. It does not produce steam, but it combines strong extraction with a 64-ounce clean tank and 48-ounce dirty tank, helping reduce interruptions during larger spot-cleaning jobs.
BISSELL markets model 3909 as having its strongest suction against leading portable deep-cleaner competition. That claim is based on sealed suction measured at the hose, so it should be understood as a manufacturer comparison rather than an independent guarantee of better results on every material or stain.
The reviewed configuration includes a Self-Cleaning Tough Stain Tool, a specialized Pet Hair Removal Tool, and a Spraying Crevice Tool. The machine weighs approximately 11 pounds empty and has a 5-foot hose and 15-foot power cord. When used with the appropriate BISSELL portable-cleaner formula, it is intended for spots and stains on compatible carpets, rugs, upholstery, stairs, pet beds, and auto interiors.
Best For: Pet owners who want larger tanks, strong suction, and attachments for pet hair, narrow spaces, and routine upholstery or carpet stains.
Why You’ll Like It:
- The larger clean tank is useful for sectionals, stairs, pet beds, and multiple spills.
- The pet-hair and crevice tools address problems that a basic stain tool may miss.
- The self-cleaning stain tool helps rinse residue from the tool and hose path.
- It provides straightforward extraction without the added steps of steam operation.
Who Should Avoid It:
- Buyers who specifically want steam or hard-surface cleaning.
- People who value minimum weight and compact storage above tank capacity.
- Users who only clean very small spills and do not need the larger tanks.
Pros:
- Strong manufacturer-rated suction for a portable cleaner.
- 64-ounce clean tank and 48-ounce dirty tank.
- Pet-focused hair, stain, and crevice tools.
- Self-cleaning Tough Stain Tool simplifies tool and hose rinsing.
Cons:
- No steam-cleaning mode.
- Heavier than the Max Pet SmartMix when both machines are empty.
- Best performance requires correct technique and a compatible cleaning formula.
Stain-removal note: BISSELL uses “instant and permanent stain removal” language for its PET PRO OXY formula. Actual results vary with the stain, material, age of the mess, pretreatment, and number of cleaning passes.
BISSELL Little Green Max Pet SmartMix Portable Carpet Cleaner (38572)
The BISSELL Little Green Max Pet SmartMix 38572 is a practical choice for quick pet cleanup, smaller homes, apartments, car interiors, and anyone who finds heavier spot cleaners inconvenient. At approximately 8.2 pounds empty, it is the lightest of the three reviewed models.
Its main convenience feature is SmartMix Technology. The tank stores water and cleaning formula in separate chambers. In Deep Clean mode, the machine mixes the solution and water at the intended ratio, while Rinse mode provides a water-only option. This reduces measuring and makes it easier to rinse residual formula from a compatible surface after cleaning.
The Max Pet SmartMix has a 32-ounce clean-water capacity and a 32-ounce dirty tank. These smaller tanks support compact storage and lower carrying weight, but they may require more frequent filling and emptying during a large job. That makes this model better for quick spot cleaning than for long, uninterrupted sessions.
Best For: Buyers who want a lightweight portable carpet cleaner with automatic formula mixing, a water-only rinse option, and tools aimed at common pet messes.
Why You’ll Like It:
- Its 8.2-pound empty weight makes it easier to carry between rooms or to a vehicle.
- SmartMix reduces manual measuring and keeps water and formula in separate chambers.
- Rinse mode lets you extract with water only after the main cleaning pass.
- The compact body is easier to store than the larger Pet Pro and HydroSteam models.
Who Should Avoid It:
- Buyers cleaning large sectionals, long staircases, or several rooms in one session.
- Anyone who specifically needs steam-assisted cleaning.
- People who would rather have larger tanks than a lower carrying weight.
Pros:
- Lightest machine in this comparison.
- SmartMix Deep Clean and water-only Rinse modes.
- Self-cleaning Tough Stain Tool in the reviewed configuration.
- Compact dimensions suit smaller storage areas.
Cons:
- Smaller 32-ounce tanks require more frequent servicing on larger jobs.
- No steam mode or dedicated hard-surface steam function.
- Corded operation still requires a nearby electrical outlet.
How to Choose a BISSELL Little Green Portable Carpet Cleaner
The best BISSELL Little Green cleaner is not automatically the one with the most features. Consider the messes you usually clean, the materials in your home, how far you carry the machine, and how often you want to stop to refill or empty its tanks.
Portable Spot Cleaner Versus Full-Size Carpet Cleaner
These Little Green machines are designed for spots, stains, stairs, upholstery, pet beds, and vehicle interiors. They can clean small carpeted sections, but they are not the most efficient choice for deep-cleaning an entire room of wall-to-wall carpet. For whole-room cleaning, a full-size upright carpet cleaner usually provides a wider cleaning path and larger tanks.
Steam Versus Standard Extraction
The HydroSteam 3618 is the only steam-capable machine in this comparison. It is the stronger choice for buyers who expect sticky, oily, or set-in messes and want approved hard-surface capability. The Pet Pro and Max Pet SmartMix use spray, agitation, and suction without steam. Their simpler operation may be preferable for routine spills, pet accidents, carpeted stairs, and upholstery.
Steam is not automatically safer or more effective on every material. Always check the care instructions and avoid steam on surfaces that can be damaged by moisture or heat.
Cleaning Modes and Formula Control
The HydroSteam offers SteamWash, Steam, and Wash modes. The Max Pet SmartMix offers Deep Clean and Rinse settings, with separate chambers for water and formula. The Pet Pro takes a more conventional approach: fill the clean tank according to the instructions, attach the appropriate tool, spray, agitate, and extract.
Choose the HydroSteam for cleaning-mode versatility, the SmartMix for easier formula control, or the Pet Pro for straightforward suction and larger-capacity extraction.
Compatible Surfaces
All three models can clean suitable carpets, area rugs, stairs, pet beds, upholstery, and vehicle fabrics. Before cleaning upholstery, inspect the care tag. A “W” or “WS” code generally indicates compatibility with water-based cleaning, while an “S” or “X” code requires a different cleaning method.
Only use the HydroSteam on tile, grout, sneakers, or other hard surfaces with the correct mode, attachment, and manufacturer instructions. Do not assume every steam-safe-looking surface is approved.
Pet-Specific Tools
Pet owners should compare the actual tool bundle rather than relying only on the product name. The Pet Pro 3909 reviewed here includes a pet-hair tool, crevice tool, and self-cleaning stain tool. The Max Pet SmartMix reviewed here includes tools designed for pet stains and tool cleanout. The HydroSteam focuses more on steam-assisted stain cleaning and multi-surface versatility.
Tool bundles may differ between retailers or special editions, so inspect the “included components” section on the Amazon listing before purchase.
Tank Capacity
The HydroSteam and Pet Pro both have 64-ounce clean tanks, making them better suited to larger upholstery pieces or several stains in one session. The Max Pet SmartMix uses smaller 32-ounce clean and dirty tanks. Its compact capacity is reasonable for quick spills but may interrupt a large cleaning job.
Remember that water adds carrying weight. A machine that feels manageable when empty can become noticeably heavier after the clean tank is filled and the dirty tank begins collecting extracted liquid.
Maintenance and Tool Cleanout
Empty the dirty tank promptly after each use. Rinse removable tanks and tools according to the model-specific manual, clear hair or debris from suction openings, and allow components to dry before reassembly or storage. Leaving dirty water or formula residue in the machine can cause odors, buildup, and reduced performance.
The self-cleaning tools included with the Pet Pro and Max Pet SmartMix help flush residue from the tool or hose path, but they do not eliminate the need to empty, rinse, inspect, and dry the machine after use.
Weight and Portability
The Max Pet SmartMix is the easiest to carry at approximately 8.2 pounds empty. The Pet Pro weighs approximately 11 pounds, while the HydroSteam weighs approximately 13 pounds. For stairs, vehicles, or frequent room-to-room use, lower weight can matter more than a larger tank or steam capability.
Also compare hose reach, cord length, handle design, storage space, and the weight of a filled tank. A compact cleaner can still be inconvenient if the hose cannot reach the area you need to clean.
BISSELL Pet Foundation Support
BISSELL states that purchases support the BISSELL Pet Foundation and its mission to help homeless pets. This is a useful brand consideration for pet owners, but the machine should still be selected primarily according to cleaning method, tank capacity, surface compatibility, weight, and included tools.
Before You Buy Checklist
- Confirm the exact model number shown on the Amazon listing.
- Check whether you need steam or only standard spray-and-extract cleaning.
- Compare clean and dirty tank capacities.
- Review empty weight and consider the added weight of water.
- Verify the included tools because bundles can differ.
- Check upholstery and carpet care labels.
- Review the current warranty terms for the exact model and seller.
- Confirm that replacement tanks, hoses, and tools are available for your model.
Frequently Asked Questions
Which BISSELL Little Green Model Is Best?
The HydroSteam 3618 is the best all-around option for buyers who will use its steam and multi-surface modes. The Pet Pro 3909 is better for strong suction, larger tanks, and pet-focused attachments. The Max Pet SmartMix 38572 is better for buyers who prioritize lower weight, compact storage, and automatic solution mixing.
Do All BISSELL Little Green Cleaners Use Steam?
No. In this comparison, only the Little Green HydroSteam 3618 produces steam. The Pet Pro 3909 and Max Pet SmartMix 38572 are water-extraction cleaners that spray cleaning solution and recover it with suction.
How Often Should I Clean My Carpet With a BISSELL Cleaner?
Treat fresh spills and pet accidents as soon as the material allows. Broader cleaning frequency depends on foot traffic, pets, children, visible soiling, odor, allergies, and the carpet manufacturer’s care guidance. Avoid over-wetting or repeatedly cleaning a spot before it has dried.
Can I Use the Cleaner on Upholstery and Car Interiors?
Yes, these machines are intended for many compatible upholstery and vehicle fabrics. Check the care label first, test a hidden area, and generally limit water-based extraction to materials marked “W” or “WS.” Do not use them on leather, electronics, headliners, or materials whose manufacturer prohibits water-based cleaning.
Can the HydroSteam Clean Hard Floors?
The HydroSteam 3618 can clean certain approved hard surfaces, including tile and grout, when used with the correct Multi-Surface Tool and cleaning mode. It is not a substitute for checking the flooring manufacturer’s instructions, and it should not be used on unsealed or heat-sensitive flooring.
Can a BISSELL Little Green Clean an Entire Room?
It can clean isolated stains and small carpeted sections, but these machines are portable spot cleaners rather than full-size carpet washers. Cleaning an entire room would take longer and require more refilling, emptying, and overlapping passes than using an upright carpet cleaner.
What Is the Warranty Period for BISSELL Little Green Models?
Warranty length can vary by model, region, and seller. BISSELL currently lists a three-year limited warranty for the HydroSteam 3618 and Pet Pro 3909. Confirm the warranty shown for the exact Max Pet SmartMix 38572 listing, review the exclusions, and retain your proof of purchase. Do not assume that every Little Green model has identical coverage.
Are Replacement Parts Available for These Cleaners?
BISSELL provides product-support and parts pages for these model families, including selected tanks, hoses, tools, and maintenance items. Availability can change, so search by the exact model number rather than by the Little Green family name alone.
How Do I Properly Maintain My BISSELL Little Green Cleaner?
Unplug the cleaner, empty the dirty tank, rinse the tanks and attachments as directed, remove hair and debris, and use the tool-cleaning cycle when your model includes one. Let washable parts dry before storage. Use only formulas approved for BISSELL portable carpet cleaners and follow the water-temperature limits in the model’s manual.
Can I Use Any Cleaning Solution in a BISSELL Little Green?
Use a formula approved for the exact BISSELL portable cleaner. Dish soap, laundry detergent, excessive formula, and unapproved chemicals can create foam, leave residue, damage components, or affect suction. Follow the tank markings and the model-specific instructions.
Final Recommendation
Choose the BISSELL Little Green HydroSteam Pet 3618 when steam, three cleaning modes, and multi-surface flexibility justify the extra weight and complexity. Choose the Little Green Pet Pro 3909 when your priority is strong suction, larger tanks, and a pet-focused tool set. Choose the Little Green Max Pet SmartMix 38572 when you want the easiest machine to carry and appreciate automatic solution mixing with a water-only rinse option.
Best choice for most feature-focused buyers: Little Green HydroSteam Pet 3618.
Best choice for frequent pet messes and larger upholstery jobs: Little Green Pet Pro 3909.
Best choice for quick cleanup and easier carrying: Little Green Max Pet SmartMix 38572.
