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I cannot give you a number, but I can say that most pressure washers come with various nozzle attachments for various jobs and there will be one that would be fine for washing your car. If you think about it, most touchless car washes have very strong pressures to break away dirt. You just would not want to use the tightest nozzle that's meant for concrete surfaces on your car. If its a nozzle meant for vinyl siding it will not hurt your car. Allot of vinyl siding is thin and would crack really easy under too high pressure.
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