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1. PSI and GPM Ratings Look for models with a PSI (pounds per square inch) rating between 1200-2000 for safe and effective car washing. A higher PSI might be too aggressive and could damage the paint. The GPM (gallons per minute) indicates how much water the unit can deliver; a higher GPM leads to better cleaning efficiency.
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When using a power washer for cleaning cars, it is essential to consider the type of nozzle attachment you are using. A wide-angle nozzle, typically 25 to 40 degrees, is recommended for car washing. This nozzle produces a spray that disperses the water over a wider area, reducing the intensity of the pressure that comes into direct contact with the paint. This gentle approach helps avoid any adverse effects on the vehicle's surface while still delivering a thorough clean.
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