i thought you were not supposed to use anything corrosive on Magteks as it will attack the (small amount of) magnesium in the wheel, i am sure i recall a thread where someones Magteks melted when they were dipped.
I have mine back now and they look loverly, tyres on mmmmmmm
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold