Power Washer Psi. A pressure washer rated with a higher PSI and GPM will clean better and faster but often costs more than lower-rated units. The pressure put out by a power washer is measured in PSI (pounds per square inch), and the PSI requirements can vary based on what you're aiming to clean.
This can be even more subjective, but it is based on the pressure washer PSI rating.
Commercial pressure washers are great for the toughest of stains and paint prep.
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The pressure put out by a power washer is measured in PSIs, pounds per square inch. For example, it'll take a lot less pressure to clean dust and salt from your vehicle than it will take to clean oil stains from your garage floor. With wood, you will need a stronger pressure washer because you'll need the strength for spraying away the mold and the mildew.