I raised this question at the dealer and went through every possible cleaner on shelf looking for something just for this problem. Nothing. It seems to be a chemical reaction with the glue and stitching. Thats the best answer I found. Noting seems to take it off that I have found. The travel trailer I just sold also had it in the awning and along the bottom of the trailer where ther was a rubber stip in a track that seperated the trailer top and the plastic/PVC skirt. It was on the rubber stip not in the cracks or seam. Right in the open. I just got a 2010 5ver and it too has a little pink in the awning.
Mike - Ottawa
'10 Rockwood 8280ws
2014 Ram 2500 SLT HD Crew Cab 4X4 3.73