Fast and furious? Interesting idea, but i'm not sure the customers will be impressed if their houses are splashed and dashed. If you want rows and rows of houses then your going to have to prize work away from all the existing cleaners in the area. I had a gutter clean, conservatory roof and windows above conservatory to do last week because her cleaner couldn't do them. Did she want to get rid of him? Strangely no. Lots of cleaners become almost friends of the family and they just won't change. Good luck though but don't make yourself too cheap.