I have a Bailey caravan and it has black streaks (don't they all) my problem is that even using Fenwicks neat, the black streaks are hard to remove, any other products or idea's better?
I use Auto Glym caravan and motor home cleaner and a good car wash solution and that always removes the black marks, just make sure the van is wet before you spray it on and don't let it dry as it may leave a dull mark that then needs to be polished out.