You will have to remove the reservoir from the car, youll need a bendy brush and bleach should do the trick. Do not try to clean it in situ, you dont want all that **** floating round the cooling system, best advice i could give you, live with it!
Believe it or not, I've heard that Steradent tablets or something similar cleans these very well. Obviously remove from the car first and wash out thoroughly afterwards.
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