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you can pull them apart, remove the seals & spray the entire unit in non-coustic oven cleaner & leave for a few hrs or overnight, using a scotchbrite scourer (usually a white scourer) & a toothbrush for the tight areas etc scrub it thoroughly & rinse in clean water, I sound like my wife lol
It is also a very good way to clean heavy brake dust build-up on alloys rims, works a treat