"professional" RV wash/wax business' use power washers all the time. I'm not brave enough to use my power washer on any of my vehicles. The reason I bought the power washer was to strip whatever from the surface I wanted to clean.
Many years ago I was at the city maintenance barn to wash my work car, there was another guy ahead of me. He fired up the pressure washer and started on his car. By the time he realized what was happening, he had "washed" the paint of the front fender and half of the hood. It seems that some goofball from the street department decided to use our washer to clean asphalt out of a back-hoe bucket. He changed tips to maximize the cleaning power and when he was done, he neglected to put things back the way they were. Needless to say the boss was upset. The director of the street department had to pay for the car to be repainted. I'll use that power washer on concrete, hardy-plank siding, brick, and wood siding in good repair; but never will you find me using it on one of my vehicles.
Depending on the PSI of your washer, the tip angle (size), and the distance you keep the nozzle from the surface will determine if you will be successful or have a bigger problem.
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2013 Silverado 2500 HD Duramax
2013 Fusion 342
2014 HD FLHTK
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