i too had the problem recently ftp.
He was an ex "window cleaner" (in his late 50's now) who couldn't do over his conservatory or his conny roof.. So i upped my quote., but did everything else gutter/fascia wise
He seemed to think that telling me he used to be a window cleaner would get him a cheap clean?? If id had done it he would have been inspecting like mad..
So i priced it up to high so that i could spend an lot of time on it.. to my no surprise i haven;t heard from him..LOL best to stay clean on some jobs.