Instead of having:
window cleaning (place) window cleaning (place) window cleaning (place) window cleaning (place)
window cleaning (place) window cleaning (place) window cleaning (place) window cleaning (place)
window cleaning (place) window cleaning (place) window cleaning (place) window cleaning (place)
at the bottom of each page, just make sure your content and tags contain the things you want to be optimizing for.
If you do that above, then you will soon be punished by Google, what worked well in the past, will now destroy anything you do.
Have no ridiculous back links to things that aren't relevant.
Ensure your text reads correctly, and not as if a robot has written it.