*** UPDATE 11 months later***
After 11 months after cleaning old TC with TSP, bar keepers friend, and applying 4 coats of Zep floor polish. The shine is not to bad but definitely not like last June. Think I am going to wash it with TSP again and apply a couple more coats. The only complaint I have had is when it rained either driving or camping the Zep floor polish residue would drip spots from cab over onto my trucks windshield. Bad enough to obstruct your view and the only thing that works is a magic eraser to remove it from windshield. Still spotting the windshield still as of last weeks rain. Believe me I tried a lot of cleaners and magic erasers won hands down. Could be because the TCs cab over paint on aluminum siding has worn away and faded. Maybe 4 coats was to much? Will have magic erasers at hand for sure.