[RPWC]

I use the pressure washer on mine. I use the soap dispenser on first, then sponge or brush it in finally rinse off with the lance but with pressure slightly reduced. I always use it for cleaning the moss out the draught skirt rail, cleaning the wheels and the roof. Never had any problems yet. The van always comes back with virtually zero damp report when it goes for service. I guess if you have a reasonably new caravan or a really old one it would be an issue.