Quote: Originally posted by GT60 on 19/9/2010
Hi Twinman
wash your van with either fenwicks or a good car shampoo but if you dilute fenwicks and put into a spray bottle this will take the black streaks off.
To stop the black streaks wash the full van including the roof then polish with autoglym super resin polish followed by autoglym extra gloss protection.
If you follow these simple instructions and WASH AND POLISH THE ROOF you will NOT get black streaks or if you do they will just wash off with normal car shampoo.