Which detergent for caravan outer wash is suitable to remove black rain strips etc. on the plastic roof and on the hammer impact facade without residue? According to your experience, there is a cleaner at all, such as Cleantruck or Berlin Caravan Elixir or TG22 from Caramba / Berner / CCS, which is self-employed, i.e. after spraying, acting and rinsing, but without large mechanical rework, completely removes black strips or is this unrealistic because a good Result without paint cleaner and polish (as before) actually cannot be achieved? Profile at the edge: Fendt 560GT6 Diamant