you need to remove the oxidation first then wax/polish it to get it to shine
look at my profile pictures that's a 11year old fifth wheel and a 15 year old truck
I used ultimate compound and nufinish
There also a new product from 3M its called Perfect-it 36110 gelcoat light cutting polish/wax. Its a one step ( it says you can get it on amazon.com and walmart.com)
2003 dodge 2wheel drive diesel 375hp 750torque
2007 citation fifth wheel model 29bhs
to see pictures of my truck and fifth-wheel click on view profile