All you conservatory cleaners - what do you do to stop your tfr getting into waterbutts connected to conservatory roofs............nothing? Be honest. 
I don't think I've ever seen a water butt connected to the conservatorys I do, but its something to think about?
I just put a topic up about echo Traffic wash, maybe this would be the answer if anyone has any worries about contaminating custy's watter Butts?