i use a little more then just scotch bright...as that would'nt work worth a bean on Allum slag...u need to fire up the dremel and use a sander drum....Grind away...once the allum is all off the drum will start to spark...IE ur back down to the steel....All the alluminum does is coat itself over and over again from the slag....so just rubbing it with 1 grit of paper wont cut it....the bell needs to be GLASS smooth...so once u use the sander drum i get out the 400g wet sand...take it to the sink and run a strip of 400..then to 600.....then i get out the rubber bit and polish it up....thats the proper way to clean up a bell..not scotch bright.