theres a guy a fews doors down from me, he had new roof tiles done on his 3 bed semi, and when i spoke to him about it, the only reason he had it done was cos he got a deal on the tiles (4K) the old tiles were ok, other than old, dirty, bit of moss & bird poop. i asked what he would pay to have had the roof cleaned? the dude didn't even know you could get the roof cleaned!
so i said what about 700 quid? he said if you did it for £500 he could even get the neibour to do theres as well, so there you have it an easy £1K !
if only someone could invent a drone or something to take a hose up to those roof tiles, and clean em!....we be millioniares by next year! i'm sure i could get customers from both sides of semis for £500 each! an easy £1000 day in day out!