Its a bit of an insult isn't it haha? I've seen him legging it down a highstreet in London before in the POURING rain. Was one of the funniest things i've ever seen!!
I think they will be getting more tack than they can deal with - and I suspect some of it would be rejected for being to filthy to start with...........
Did look at mine and thought it needed doing - then thought I only cleaned it 3 or 4 weeks ago before the yard show - so weeks before it needs doing again......