Used this on my concrete driveway that hadn't been cleaned in years. The 3200 PSI made quick work of oil stains and mildew. Honda engine started on the first pull every time.
Simpson CleanMachine CM61083 Gas Pressure Washer
The Simpson CleanMachine CM61083 is a dependable mid-range gas pressure washer that delivers commercial-grade cleaning power thanks to its Honda engine and robust axial cam pump.

Full specification
Simpson
Simpson CleanMachine CM61083 Gas Pressure Washer
- Commercial-grade cleaning power
- Reliable Honda engine
- Durable steel frame construction
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Where it lands
Verdict
The Simpson CleanMachine CM61083 is a dependable mid-range gas pressure washer that delivers commercial-grade cleaning power thanks to its Honda engine and robust axial cam pump. It's an excellent choice for homeowners tackling tough outdoor cleaning tasks like driveways, patios, and siding, though its weight and gas-engine maintenance needs may deter those wanting a lightweight, low-maintenance option.
Key features
What you actually get
Powerful Honda GC190 engine for reliable cold-start performance
3200 PSI at 2.5 GPM for heavy-duty cleaning power
SIMPSON-exclusive axial cam pump with thermal relief valve
5 quick-connect nozzle tips for versatile spray patterns
Powder-coated steel frame for durability and rust resistance
10-inch never-flat wheels for easy maneuverability over rough terrain
Strengths and trade-offs
Where it wins, where it costs you
+Pros
- Strong cleaning power handles driveways, siding, and decks with ease
- Honda engine starts reliably and runs smoothly
- Durable frame construction built to last multiple seasons
- Onboard nozzle storage keeps tips organized and accessible
- Comfortable spray gun with adjustable pressure control
–Cons
- Heavier than electric models, harder to transport up stairs
- Louder operation typical of gas-powered engines
- Requires regular maintenance like oil changes and fuel stabilization
- Hose is somewhat short for larger properties
Full review
Our test notes in full
The Simpson CleanMachine CM61083 is a gas-powered pressure washer built for homeowners who need serious cleaning muscle without stepping up to full commercial equipment. At its core sits a Honda GC190 engine, a name synonymous with dependable starts and long service life, paired with an axial cam pump that Simpson engineers specifically to handle the demands of residential and light professional use. This combination delivers 3200 PSI of pressure and 2.4 GPM of water flow, giving the CleanMachine enough force to strip away caked-on grime, algae, mildew stains, and old paint from driveways, siding, fences, decks, and outdoor furniture. The pump housing is constructed with a mix of metal and reinforced components designed to resist corrosion and wear, so the unit continues to perform reliably even after repeated exposure to detergents, hard water, and outdoor storage conditions.
Beyond raw power, the CM61083 is designed with practical usability in mind. It ships with a 25-foot high-pressure hose that gives users extended reach around vehicles, patios, and larger properties without constantly repositioning the machine, and the hose is built tough enough to resist kinking during aggressive cleaning sessions. Simpson includes five quick-connect nozzle tips—0, 15, 25, 40 degrees, and a dedicated soap nozzle—allowing users to switch instantly between concentrated blasting for stubborn stains and a wider fan spray for general rinsing or gentle siding cleaning. The onboard detergent tank and low-pressure soap application feature make it simple to apply cleaning solutions before rinsing, which is especially useful for degreasing concrete or breaking down organic buildup on wood and vinyl surfaces without needing a separate injector.
Portability and durability round out the CM61083's design. It rolls on large, never-flat wheels that handle uneven surfaces like gravel, grass, and cracked concrete, making it easier to move around a yard or job site without getting stuck. The frame is constructed from powder-coated steel, giving it resistance against rust, scratches, and the general wear that comes from outdoor storage and frequent transport. Simpson positions this model as a workhorse for tackling recurring outdoor cleaning tasks—from seasonal driveway restoration to vehicle and equipment washdowns—backed by the brand's reputation for pairing trusted Honda engines with pumps engineered specifically for pressure washing applications, resulting in a machine that balances raw cleaning power with everyday reliability.
Owner voices
What buyers report after months of use
This thing cleans like a beast, but it's definitely heavy to move around, especially up my sloped yard. Still, the results are worth it and the build quality feels solid.
I was impressed with how evenly it stripped old stain off my deck. The nozzle variety is super helpful for switching between delicate and aggressive cleaning.
Performance is great, but I found myself needing an extension hose to reach the far end of my driveway. Otherwise, no complaints about the cleaning power.
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