The "snot" like substance is bacterial build up and it is possible that it contains Legionella bacteria so just be careful when blowing it about with an air-line! It will grow in the spray heads particularly because they are heated and bacteria just LOVE the warm conditions which is why they grow in cooling towers and air con units. 
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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