i do this house for 7.50 every month first time wfp last month when i went to collect they asked me if i can get to the window above the glass roof which is like a little extension i said if my pole will reach then yes i will good they said i will pay extra only a little window now i said to them the prob is that all the muck will run down on to your glass roof oh do that as well then how much for the glass roof only 3 pains of glass and the small window not forgetting this is to be done every time this house gets done dont want to over price and loose the whole house any advice