Your work is great - I think its very brave of you to do urban gungings. Presumably you've been approached by the odd policeman from time to time? Also, do you clear up the gunge, or do you just leave it? Your gunge doesn't look much like natrosol but more like melted ice-cream... Is that the case?
I have been online since 2000 and have been learning as I go along! Always changing, always growing!
leonmoomin