Got a bit of a problem. Took the caravan away a couple of weekends ago and on the way home it got well and trully covered in brown road grime. Unfortunately I didn't have time to wash the caravan until the weekend just gone. After washing, the back of the caravan and part of one side are covered in orangy brown streaks. The caravan is a 2006 Abbey so it has GRP sides. It's as if the muck has dyed the grp. have tried black streak remover but it doesn't touch it. Anyone any ideas?
