GrandpaKip wrote:
A power washer gets its effectiveness from high pressure. I don't see the benefit of using low pressure other than to put out a lot of soap at once. As mentioned, to really get it clean, you will probably have to use good old manual labor.
Neither do I and I've had pressure washers for decades. I prefer not to pressure wash ANY rv. Reason being is that pressure washing can (and will) inject water in any seal area that is the slightest compromised.
Water and RV's don't mix well. Water intrusion = rotten wood, mold and eventually the unit is junk. Why accelerate the process by pressure washing when a bucket of suds and a sponge and / or brush is much less invasive.
Most owner are already lax in seal maintenance or never even check them.