Someone not too long ago posted a recipe for a solution the camper dealers use to wash campers with. A mixture of Simple Green, Bleech and Water. I've had black streaks on our camper for over a year that I couldn't get to come off no matter what I tried. Well I just washed my camper today, so I mixed up roughly a cup of Simple Green, a cup of bleech and water in a bug sprayer. I sprayed a good sized area with this solution and let it sit for a minute or so then washed as usual with regular old car wash in another buuket with a large brush on a pole that I use to wash the camper and the siding on the house. To my surprise even the black streaks washed right off no scrubbing at all. Just a regular old wash and I don't have any more black streaks anywhere. WOW!!! I am truely amazed.

I've been using bleech and water but Simple Green apparently is an important part of this mix. It cleaned way better than bleech or simple green all by them selves. I've used both on the black streaks with little to no success prior to today.