The debates re caravans are basically that you need to make sure the paintwork is immaculately clean before dragging the cover over it or youll slowly but surely get loads of little scratches at least.
If your parked up somewhere manky and need the cover for that reason, let if drop once on the ground and youve got nice bits of grit sticking to the inside soft lining sort of self defeating.
So following on from that, if your going to have to clean the thing, why not just wax it up, let it stand and then clean it for a sparkling trip out when you need it :nenau
Also as pointed out by Rustic theres a lot of stories around about damp damage even with the multi hundred quid "breathable" covers. Not experienced it but I have seen the alleged effect on amongst other things caravan decals and stickers.
I can quite understand why a collectable or summer car gets covered up for longer term storage but on a day to day basis cars are designed to get wet dirty and hopefully sun shine on them :thumb2
I have just bought one of the waterless cleaning kits. Its a 1 1/2 litre bottle of milky looking fluid, a trigger spray and 2 microfibre cloths
I saw ads for it in the 4x4 mag that said even in sandy dusty places you could use it without scratching
but it was "HOW MUCH!!!!!!!" expensive.
Cant be selling too well as mine was reduced to £9.99 in Boyes (our local discount store) .
I got it with the caravan in mind I'll update once Ive tried it :thumbs
In the meantime if your wanting to "dust off" a clean car Ive found these to be very good
http://www.theultimatefinish.co.uk/autoglym/instant-show-shine.aspx
http://www.monzacarcare.com/meguiars-exterior/meguiars-ultimate-quik-detailer-spray/0/
:thumb2