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