Long UV exposure breaks down the factory finish on aluminium cladding until the surface oxidises and goes cloudy. It looks like grime that will not wash off, and no amount of washing shifts it - it has to be cut back mechanically and then sealed so it does not come straight back.
Printed vinyl graphics fade and go brittle long before the cladding does, and they are the part a machine polisher will destroy fastest. They get masked or worked by hand. If a decal is already past saving we will tell you that rather than polish through it and hope you do not notice.
A van stored anywhere near the water collects salt in every seam, around every rivet and behind the checkerplate. Combined with dissimilar metals in contact, that is where corrosion starts on a caravan.
The front cap, A-frame and lower cladding take everything the tow vehicle throws back at them. It is the hardest-worked surface on the van and usually the one in the worst condition.
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