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Muk Off is a citrus based biodegradeable degreaser for bikes etc, unless I've got my wires very twisted, and as such, not really for wheel cleaning. I'd go with the above post.
Alcazar
I've tried both (do a bit of mountain biking) and Muk off is OK for back wheels - ie just general road muck/dust, but its cr*p on the front on brake dust.