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Goto B&Q and buy the smallest Costic Soda they got about £3Pour half into a plastic container/bottom of bucket and enough water just to cover the chainring.Use a set of tongues or rubbergloves to place in .. then keep checking every 30seconds,, should be done in 2mins.easy
just out of interest, how do you dispose od the costic soda? is it harmful to the environment?
You can find an anodizing company and ask them to de-anodize whatever you have, I'm getting some rims done next week so will report.