Originally Posted by Johnshepp
I have a 2003 Winnebago bought last February. Kept it under cover during the summer (Florida) as had to return to UK. Arrived back here this month and most of the white paintwork has gone yellow. Any suggestions as to how to turn it back to what it should be
I'm guessing the white on your 2003 Winnebago isn't paint, but gel coated fiberglass. Paint was only used on the very highest-end coaches prior to 2003-4.
I have had good success on our oxidized fiberglass roof with Meguiar's Fiberglass Oxidation Removal Kit. It contains oxidation remover to get rid of the yellow and dull finish, polish to bring back the shine and wax to protect the surface.