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US cleaners are such as used with water and some detergents etc. to remove gunk from many different items. Even the little ones 500ml for contact lenses can work for a razor head. A 1 litre capacity...

I normally use a citrus cleaner (as above) (cheap)
Then i use a white or cider vinegar soak to loosen the crud.
Then while wet from the soak, I run the razor through all its mechanical paces. That...