How do you deal with customers not sticking to the schedule? Example; nice big detached house in the middle of your area, priced high for 6 weekly job. Arranged for tomorrow with others in the street, text day before; she wants next week Wednesday at midday... I have a few new customers like that recently, higher paying nice jobs, but not "trained" yet 
Do I explain the price is for 6 weekly visit on the day we can, on request visits are double? Or accommodate for few months and try to educate how to be a good reliable customer? Worried I'll be wasting time, probably why last window cleaner left.
I work by the area, and return visits costing me money (travel time).
Simple.
You message them saying you'll be round tomorrow. They say not suitable, you say no problem see you in 6 weeks.
When they moan you tell them how you work, it's when you are in the area or leave till next time.
Now they will either fall in line or get the hump and cancel, which is great as you have now got rid of one pita job off the round. If you have 20 of these jobs then in no time at all they will be gone which again is great.
If there's one thing I've learnt that will make your life much easier is do not hang on to poor work , constantly be advertising and willing get rid of jobs like they were turd on your shoe.
Think about it what does keeping that job do for you ? Nothing but lower your profit and stress you out. Its like choosing to sit on a park bench full of bird muck rather than walking further down the path and finding a clean one. It's the easy option and fear that there may not be another clean one come along but youll never be happy sat eating a sandwich next to bird muck. I've done it in town sat outside Gregg's eating a pasty and those benches put me right off.