Hi,
Several years ago, someone responded to a window cleaning thread on this forum recommending Great Northern Cleaning out of Tilton:
http://www.greatnortherncleaning.com/
I just used their window cleaning services for the first time this summer and am very pleased. First, my windows were filthy and had not had a proper cleaning in a long time. Two guys came with a truck containing several ladders of various sizes. They removed and washed our storm windows, scraped the parts that were slightly covered from the house painting, and even used a vacuum on the pesky pine needles in the sills!!! I don't know how competitive their prices are, but I believe they will give an estimate first. I can see out my windows again and am very happy.