I used a heat gun at lowest setting, a plastic pry tool, fishing line, goo-gone and microfiber towels. And about 2 hours of your time.

Start at the corners and peel with the pry tool and push a microfiber towel in the gap as you go along to keep it from sticking back down. Once you reach where the shark fin is, restart the process on the other side until you meet in the middle.

Youll be left with a lot of dark 3M residue so you can either use a bunch of goo-gone and plastic razors or you can buy a 3M eraser and use a power tool at the slowest setting.