That text is fine,
Very important is to have an image. The one on your avatar would be the best I've yet seen.
You really want to sell the fact that a lady will be coming to clean the windows, believe me, you will have customers flocking!
When people think window cleaners, they think scruffy, ropey looking men who they don't really want around. A picture of a nice lady cleaning windows will really go down well.
I don't mean to sound sexist, but honestly, the fact that your good lady is working along with you is the biggest selling point you have, make sure you put an image of her, in colour on the flyer. My guess is that your response will be very good.
Another thing, put an email address on it too. These days people use email for everything, and they find it easier than phoning up and talking to someone.
When they do call, (here I go again) it would be best if your young lady answers. People much prefer to talk to a lady, no matter what its regarding. They feel less pressurised and immediately at ease. No kidding, it works!
Let us know how you get on.
-Philip