I have freed up badly rusted/corroded bleeder screws by heating them with a torch, but only after removing the wheel cylinder and stripping it down to a bare casting. Once the bleeder is out, replace it- - - -they're usually readily available and cheap, but so are complete, new wheel cylinders.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!