What's a good counter to this email?

Hey Everyone! So I have this fancy burger joint that I’m trying to acquire and already sent a few bids… and I recieved an email today from the owner that he isn’t interested in hiring a window cleaning company due to working with other ones in the past and not getting much better results. So I was wondering what’s a good counter to this? Thanks a bunch!

We’d like to earn your business every time we come out.