If you clean 30 houses a day; that's going some. By myself a hefty day is 20.
If you raised your prices by 50%, and were dropped by 50% of your customers; you'd be doing half the work, for the same amount of money!
What about a 25% increase?
I collected this evening from a couple of houses that I raised from £6.50 to £10.00 recently. I thought that because the houses were awkward to do and I only had four of them there, I'd chance my arm.
Only one of the houses dropped me! The rest were quite happy.
Go for it!