Hey Mike,
Why not focuse more of your effort into tile and grout cleaning? Everywhere I go, there is opportunity in this. Take a good hard look at a small investment like the Turbo Hybrid from Turboforce and start doing that. Diversify and do not let "the economy get you down" there are plenty of opportunities out there and you just need to seek them out.
If your current machine can do pressure cleaning with heat up to about 1200 psi, you have a built in revenue resource.
One good piece of information I learned when I had my cleaning business over 15 years ago was to use a "STOP" sign" in all of my advertising. When people see that, they WILL stop and read it. This helped me out tremendously when I used to clean. (very simple concept) Try it, hopefully it will work for you as it did for me.
I hope this helps to get the phone ringing on a regular basis..
Jim