I've had a disastrous day, first clean was OK turned up to do the second job and was asked to squeege the window off after by a customer who I've had for 5 years always done the tops of her chalet bungalow WFP but I only switched the bottoms over last month, as she has a sheltered rear patio I'd kept it trad,
anyhow her reason was it looked like it had been raining when I asked if the clean was OK she replied yes, I reluctantly agreed to do it mainly because she's an old biddy and I like her.
I moved on to next door picked that one up about 6 months ago and she asked me to do the same and I refused, she then told me her windows dried spotty and her husband had to go over them with a squeegee :

and she paid more than next door, which is quite true as I hadn't put the price up in 5 years, So I told her they shouldn't be spotty after I'd cleaned and I'd check my TDS and rearrange her clean TDS meter was at home and guess what it was 10 ppm

oops all my fault I guess,
Oh and I calculated the under priced job that's £8 2 monthly should be £16, If I cut my losses with both of them I'll loose a whole £9.50 a month Oh no