I waxed both sides of all three slide today and the paste wax took the black marks off where the rubber seal had stuck. It actually just wiped right off. I also used Protect All Rubber Seal Treatment on all the seals except the top, I could not get to them with the toppers. I also used protect All Slide Out Dry Lube on the tracks on the bedroom slide and rails on the other two slides, I ran them in several time and they glide now. The wax helped as well I'm sure. Now I can't move, but it's done.
2012 Ford F450 Lariat FX4 dually, 2013 Redwood 36FB Red and Black Painted