Best for Solution / Liquid system
BISSELL Big Green Professional Carpet Cleaner
4.9 feature score
Highest scored product for this feature based on supporting review evidence.
Best Carpet Cleaning Machines for Solution / Liquid system
Solution / Liquid system Decision Dashboard
Safest pick
Hoover PowerScrub Carpet Cleaner Machine
4.5 feature score
Balances feature score, supporting reviews, and overall product strength.
Most evidence
Bissell CrossWave Vacuum Cleaner
9 supporting reviews
Has the broadest review evidence for this feature.
Best overall product
Hoover Smartwash Automatic Carpet Cleaner Machine
4.1 overall score
Strongest overall product among items with scored evidence for this feature.
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The liquid system stood out for efficient water use, removable/refillable tanks, visible solution status, and strong area coverage before refilling.
Pros: Pet-Ready Features, Tool-change simplicity
Cons: Innovation compared to competitors, Weight
Spray and liquid delivery were praised for a strong, generous spray and quick solution flow without priming.
Pros: Cordless convenience, Comparative performance
Cons: Overall durability/longevity, Support and Reliability
The wash/rinse and solution systems were praised for flexibility, automatic dispensing, and generally sensible water/solution use.
Pros: Pet-Ready Features, Tool-change simplicity
Cons: Overall durability/longevity, Build quality and durability
The liquid and solution system was divisive: several reviews praised the oxy or dual solution boost, while others found solution use high or saw little difference from Shark’s formula.
Pros: Pet-Ready Features, Clogging and debris prevention
Cons: Wool carpet compatibility, Noise level
The liquid system is easy to fill and measure on some reviews, but other evidence criticizes average water use and lack of auto-mix.
Pros: Hair Pickup — Carpets, Airflow blowback
Cons: Stair Cleaning, Suitability for heavy-duty use
The liquid system and CleanShot were divisive: reviewers liked targeted pretreating and easy use, but complained about aiming, splatter, fast spray, and questionable benefit.
Pros: Support and Reliability, Stair Cleaning
Cons: Clogging and debris prevention, Kid-friendliness
Solution-system feedback was mixed: manual triggers gave control, but solution consumption, no dwell time, small tanks, and missing separate or automatic dosing were drawbacks.
Pros: Cord length, Cordless convenience
Cons: Under-Furniture Pickup, Crevice / Groove Pickup (Hard Floors)
The liquid system divided reviewers: automatic mixing and dispensing were praised for simplicity, but sensor and speed-threshold issues hurt performance in some tests.
Pros: Pet-Ready Features, Tool-change simplicity
Cons: Support and Reliability, Overall durability/longevity
The liquid system is a tradeoff: solution use supports cleaning performance but also drives frequent refills and longer drying.
Pros: Pet-Ready Features, Tool-change simplicity
Cons: Cord length, Airflow blowback