Ditto on the beadblasting, but take the pulley off the alternator first. Grit inside that unit isn't its friend and you can't seal it up well enough to keep the dust out. You could always go to an original-type pulley and solve the problem for good!
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!