I used Fenwicks for the first time the other week, I was very impressed with it, & I used the "Bobby Dazzler" in the rinse water.
I only wish I'd had a hose, but sadly didn't have access to one.
I think I would use a pressure washer only to "mist" over the 'van to wet it down or to rinse off prior to using the Bobby Dazzler again. Just sounds like it pays not to get too carried away with it. The high pressure on them is really only meant for patios & stuff like that.
I leave it on the car for about 5mins,on the van which is 25ft, by the time ive sprayed it on its ready to come off.You dont have to have a top of the range power washer to take it off either a cheapy will do failing that good water pressure from a hose.There are guys on you tube putting it on/off with a garden hose...
I have used one with a rotary brush on the end. These actually give very little pressure (I comfortably placed my hand on the brush to check) It really took the green slime of the roof and being on a lance I was able to reach the centre of the roof from a step ladder. I rinsed the soap with a hose pipe after though rather than risk damaging the seals.
i used a pressure washer on my last van ended up buying a new van two seals had failed full of damp in the end bathroom traded her in and would nt use a pressure washer ever again but thats only my opinion like a few av said already a gentle brush and fenwicks or anyother caravan cleaner and it comes up great
i was told never use high pressure washer on a caravan but that its ok to use a low pressure one ill stick to a bucket and sponge or clean n shine though.
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I have used snow foam and a jet wash on the car but never on the van. I also find with snow foam, that some will strip the polish etc and those that don't aren't that good at cleaning. You will also need a special snow foam bottle lance adapter to get the best out of it. Best to get stuck in with a hose and brush,give the windows a good rinse first to avoid scratches, with Fenwicks or similar and use a good polish when dry.