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@tynan
Mavic do a rubber - like an eraser you would buy in a stationary shop to rub out pictures you have draw of cocks on your geography books - it is formulated to pick off all the very very fine particulates that screw up ceramic rims but it works just as well on normal rims.
A regular road crap magnet.
I have no more information as I can't find my one and can't be bothered to look it up.
Otherwise use some mid grit sand paper.