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Old 17-06-20, 09:04 PM   #3
tractor Dave
Grown up member
Classic Audi Club Member
Join Date: Apr 2018
Location: Wales
Posts: 875

Try a dishwasher tablet inside it, seal up the bottom holes and fill it with hot water from the kettle. Put the lid on and shake it all about. Leave overnite and hopefully most of the crud will have been removed. Flush with very hot water.

Or Mike's suggestion sounds good to try.
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