Thats right,
i am quite wary of cleaning them now, especially lean to ones, where there is a pelmit type thing against the wall,
i once tried to get under it to clear leaves, and ended up with dirty water running down a newly painted wall,
luckily the decorater was in the house and the owner was not...
and i paid him £20 to go over it, and i was lucky again, that he had a laugh and was a decent bloke.
