Won't last, they will get a good "one off" on a promise of love ever after.
You'll do all the hard work at a not good enough price.
Some low down ladder monkey who has never cleaned a window 'FRAME' - Duh "Never noticed the frames" will benefit from all your hard work.
Then it will start raining or maybe snowing - oh and it will be windy as well as freezing cold.
Then you will leave ONE spot on your easiest best customer's window and she will dump you.
