$15.00 would be average price. I assume you will be cleaning the inside of both the doors as thats just "standard" even on a outside only job.

You can even get away with charging $10.00 and make a good profit if you are very fast and you have much other business in the immediate area.

If not, $15.00 would be fair, depending on how "regular" the windows are scheduled to be cleaned, how far you have to drive, and even if you actually want / need an account like that.

You might want to do it once, then refer it to someone else who in turn, might refer you onto a residential account if you really dont want to get involved with "commercial / shop-front" gigs.

Chris / Shiner :-)