Scotchbrite and lots of brake cleaner
https://en.m.wikipedia.org/wiki/Scotch-Brite
Green scouring pads are a quick and easy to get hold of alternative.
Told not to use brake cleaner on bike disc as brake cleaner can leave a residue, hence why you are supposed to use IPA
@Dibble started
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Scotchbrite and lots of brake cleaner
https://en.m.wikipedia.org/wiki/Scotch-Brite