Cleaning black streaks

Looked at 2oldman's post on the subject. Did not see S-100 from your Harley Davidson dealer. Nothing works any better, Easy to use, spray on wait 3 minutes and wipe off. DONE GUARANTEED

Hello! New here but I've had RV's before and used Simple Green. Home Depot buy the gallon and don't dilute it. Spray it on with a spray bottle and and rub it with a sponge. Seemed to work pretty good.

You might try spraying a small area of black streak with WD40 and wipe it down. WD40 works great for dissolving road tar, bug, and a bunch of other thing. I have used it on black streaks too and it does help remove them. Test a small spot on your camper first. (just to be safe).

TR3 Resin Glaze

Auto part store or Wal-Mart, get the road tar off too

If you cover the RV there should not be any or many black streaks. IMHO they come from leaves that fill the drain channels on the roof and the runoff stains the walls. The cover keeps the leaves out.
Oh! and stay out of the sun...