I have/had a messer who's never had her windows cleaned by me. Here's the back story.
I do an ex council semi about 400 yards from the next customer so not far but you have to pack away and drive. I charge £13.00 every 8 weeks. Also had a gutter clean as well, been going about two years. It would be nice to have two reliable ones together but hey ho.
Six months ago I tip up and her neighbour asks me for a price. I say I'll do it for £20 today and then £13.00 every 8 weeks. She says oh, that's a bit much can you do it for £15? No. I know someone who'll do it for £12. Okay. Bye.
I just finish "mine" last week who says the neighbour wants a window cleaner and will I do them and she will pay me? I explain that I would charge her neighbour more than her and why (First clean, doesn't sound reliable etc. and I'd rather not take her money and then find she has difficulty getting it back.)
I get a phone call off "Mrs Desperate" how much, need 'em doing Wednesday. £22.50 followed by £15 every 8 weeks. You said £20/£13. That was 6 months a go. Oh I can get them done for £15 straight away. Okay you do that, bye.
Still not done.