Bite the bullet and take someone on to help you!
When I first started I was out cleaning 7 days a week, then decided to take someone on to help me out. I reduced my working week to 5-6 days a week and also increased both turnover and profit.
We now have 18 staff including 6 full time window cleaners, also do carpet cleaning, stone floors, leather restoration and office and domestic cleaning, touch wood business is going very well.
Yes it can be a hassle having staff and it's not for everyone, but having staff allows you time to work ON your business rather than IN your business