Better quality pressure washers come with a selection of wands that have different focus at the tip. I have one with three wands, one of which I use to wash the cars at home and it does no damage. The most aggressive wand on the same machine effortlessly strips paint. I use the different wands on different parts of the boat.
As was said some time ago on a varnishing thread, if you want to work hard you can always find a way but you don't need to. If you only have one wand and it could cause damage, just vary the distance of the tip from the surface to be cleaned.
As SD says, in the hands of a dumbo any machine can do damage.
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