What gets double sided tape off?

[sphell]

I'm having drama's with the bloody side moulds on my car. Since they were left off for so long while the car was painted, they have warped and whenever I stick them on the car they gradually peel off again.

Anyway, I used the good 3M double sided tape on them the first time and now it's stuck to all the doors. I want to get it off without damaging the paint so does anyone have any magic product that will do this?