Carson, try brake parts cleaner in a spray can. Or in a pinch, starting fluid. That's what I always use to clean up brake drums on my big rig when an axle seal would go south.
Jst be careful w/the starting fluid is all, be sure and do it outside.
Marlin, The differences in the pulley dia. has something to do with whether or the engine in question has ACR or not, according to the parts book I have.