I do that Wizkid.
I had a lady come up to me in the street yesterday and ask me to quote. It was a small victorian cottage semi about 150 metres from my nearest custy - but has loft rooflights and a third floor dormer so I gave her the following options after establishing that this was to be a regular arrangement.
First clean including rooflights and dormer - £25
Subsequent every two months - £16, every month £13, but no 3rd floor and rooflights included - but she can ask me to add them in a couple of times a year for an extra fiver.
All written on a card and she's having it (oo err matron!
) every other month for £16. I did the first clean on the spot.