cleaning products

hi folks.can someone plese tell me what the best cleaning product is for the front plastic on a caravan.ive just washed my elddis avante and cant seem to get it that clean at the front.it has dark water marks etc.and generally looks a bit dull.ive tryed autoglym products as i swear by them for my car but i just dont seem to get the same results.

it looks nice and clean but im very fussy with things like this and would prefer a nice glossy shine.

ive only had the van a month or so but it was lovely before we went away last week,now it seems the front looks a bit tired.

once i get it sorted how i want it,i will buy a towing cover for the front.

any advice would be great

daz