If it's double sided tape, it should be similar to removing badges - it's usually easy enough to cut through lengthways using a bit of fishing line (or similar tough plastic/nylon that won't scratch paint)
Once the trim is off you can remove the remainder using some sticky stuff remover
If that's the window trim, looking kind of grey and whiteish, I used a pencil eraser on it to remove the built up residue. Then I applied some armor all. Looks nearly new.
Took a little time but results made me happy.