Black Streaks

x2

They've said it all. Wash the top 3 times per year or keep the trailer undercover. Keep the gutters cleaned out, and use gutter extensions. Keep the trailer waxed, and wash the trailer sides often.

That's about as good as you can do.

Keep your roof clean and make sure the little gutters on side are in good shape. I had to caulk the seams on ours and that stopped 90% of them. Waxing also makes the streaks easier to remove.

Keep it in the garage when not in use.

To prevent black streaks, keep the roof clean and the rig well waxed to make removal if necessary easier. :) A never ending battle. :)

The 'magic sponge' think it's Mr Clean brand in the supermarket gets rid of them. Works great on the shower enclosure too.

I use the remover from walley world.

I do not keep the streaks from reappearing.