I used to clean a fish and chip shop, inside and out a few years ago. The original owners were the best customers you could hope for: friendly, always got a tea and a free meal. All was well until they retired and sold up.
The new owners turned it into an Indian takeaway. I was asked to carry on, but they were reluctant to pay me the same price that I had been charging, yes the same price! In addition they moved the cooking hobs etc to the front, next to one of the large windows. To clean this I had to stand on a swivel chair and risk falling onto the hob! There's more...
... The small fanlight over the door was smeared in chip fat (inside and out) which took ages to remove. No other windows were affected. I mentioned it to the owner, who clearly didn't care. He also made me wait before before paying me.
Two weeks later everything in the previous two paragraphs happened all over again. I never went back, although I wrote him a letter saying I wouldn't be doing his windows again.
John.