Ok, so long story short, when I bought this camper used, it was stored outside someplace in Iowa. The rear of the roof line looked like this:
After some discussion with the folks at the parts place, I tried the Black Streak Remover...
...and it came off really easy. After about an hour in the sun, the yellow color went away and even today, it looks bright white like the rest of the TT.
Where we've been:
2000 Rockwood Roo M-18 Hybrid
2006 Dodge Ram 2500 Auto 5.9 Diesel
Gone but not forgotten -1986 Rockwood 1003 PUP