A surefire way would be to remove the heads of the screws with a Dremel
cutoff wheel, then apply PB Blaster or something to the stud and turn it out
with vice grips when it gets free. When you replace the screws, put some
anti-sieze compound on the threads before screwing them in.
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
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Having a devil of a time trying to remove the rear license plate. All four
screws are frozen to the backers. All I've managed to do so far is break
one of the screw backers. The last time I tried this (a year ago) I had to
take the car to the dealer to have it removed.