It's funny why folk choose/keep a window cleaner. Cheap/familiarity even pity do sometimes figure.
In my street there is a guy who cleans two or three within sight of my house. One house is across the (fairly busy) road. Trad and uses a 1990's reg Volvo estate; slow as slow can be - no frames.
The young woman there with her husband/partner and little kid is about 35; she works as the bookkeeper in one of my small industrials I clean in Avonmouth. I cleaned this industrial before she started there or moved in and we only recognised each other as neighbours when she got my payment slip to pay with my address on.
So I clean this industrial, she pays me £25 and chit chat "how much would you charge to do my house just down the road from you?" I said "without looking, about £12.50 to £15.00 every 8 weeks" (3 bed ex council semi)
"Oh I pay £12.00 every month but he doesn't do a very good job - trouble is I feel sorry for him ..."