Me personally, i say why bother?
I've been doing window cleaning for 21 years, and have never had a website for that business (but i have and do have other websites). I did advertise with Yellow Pages the first year i started, but have never bothered since. There is so much work out there it comes to you anyway without spending on advertising.
The only reason i would have one now is so that people could pay me online, as i have seen on a few other cleaning websites recently.
Seems like a good idea. Saves keep going back to collect. (Not that i do that nowadays)
Richard