Quote:
Originally Posted by [1ponders]
It does need a clean Marc, definitely. Fungus starting, finger print 
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Ouch! Sounds like it needs a major clean then and you have no choice. Take it off and stand it up right on a bench, because it looks like a salad bowl, you can fill it in with demineralised water with a dab of dish washing liquid, then clean it with cotton wool. Let it soak a bit then finish all the remaining dry evaporation spots with acetone.