This has been discussed at length here on the forum, and I don't think there is a magic solution to getting DS off without damaging the paint... much less the clear coat.
When I took delivery of my new 40DP in 2007 they had installed the DS over some water spots.
I had them remove and install another but not even the dealer could get off a new DS without having to repaint the front of the rig.
I think a hair dryer (probably not a heat gun) would be OK to use to give it a try but I wouldn't hold out a lot of hope that it'll come off without damage.
Best of luck.
Rick