There are several threads on the forum that address cleaning. Do a search for "polish" — that should give you a start.
I cleaned my Triton last November, before putting the cover on for winter. I used Fenwick's caravan cleaner to wash the muck off, and then their Bobby Dazzler as a rinse, which you can either allow to dry in place or you can leather it off. Some users apply a polish and a wax, but several people with the dimpled panels say that it's hard to get the product out of the dimples, leaving a dull residue. The Bobby Dazzler is a water repellent, so it should be enough protection. What you ought to do, however, is apply a good wax (I use Harly's wax) for the GRP roof and the pop-top, because the material these are made from deteriorates in daylight without the extra protection given by the waxing.
Agger is the go-to member for advice on this topic. By my calculation he's already cleaned, polished and waxed his Eriba 43 times since New Years Day! 😂