I'm assuming you've tried pulling straight up on the magnet. You didn't say what kind of magnet it is, but try to slide something between the magnet and the car. If that doesn't work try to slide it to the edge of the panel it's stuck to and slide it off. Good luck.
There is a cleaner which is called "Goo Gone" pour that on the magnet (its safe for your car) wait a few minutes for it to soak into the back a little bit then take a piece of fishing line and slowly "shimmy" it behind the magnet and just slide it down the back it should work.
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I'm assuming you've tried pulling straight up on the magnet. You didn't say what kind of magnet it is, but try to slide something between the magnet and the car. If that doesn't work try to slide it to the edge of the panel it's stuck to and slide it off. Good luck.
There is a cleaner which is called "Goo Gone" pour that on the magnet (its safe for your car) wait a few minutes for it to soak into the back a little bit then take a piece of fishing line and slowly "shimmy" it behind the magnet and just slide it down the back it should work.