Do you mean to tap it underneath on the window side pushing it outwards? These pieces are a real pain. Theres still small pieces of the vinyl roof stuck under this trim so it definitely needs to come off.
Yes, It has to be released from the bottom. It will be tight if it is over vinyl top material on drip rail. If it is folded
over on the end, you may have to stick something in there to unfold it. Patience is required if you want to remove
it without destruction.
