Tim,
One of the ways I used to find out what the price market average was, is to ask a few friends to get some estimates for me.
Tell them what you want them to ask and touch base with them after the company leaves.
I know some might thing that is a little under handed, but it was the only way I knew.
You can always get a list of who your friends used for the bids and send them easch a job when work overwhelms you later. It's kind of way to pay them back for their trouble.
We all have a view jobs we bid that we don't get, so I quess it's not to bad. Who knows, one of your friends neighbors may see them in the neighborhood and call on them later.
Just a thought.
I charge anywhere from .03 to .25 a square ft. depending on the job. If it is a residential driveway or sidewalk, I normally charge at least .10 cents a sq. ft.. If it has several caked on grease spots that I know will take longer, I may charge .15 cents to .25 cents. It has to be pretty bad before I will ever rise to .25 cents at a residence. Remember, annual contracts always demands the respect of lower pricing. On House washing I average $1.00 per linear ft. single story and $2.00 on two stories. I also add a little for cost of chemicals and fuel.
Hope this helps
Richard R.