Window cleaning advice - exterior

[notnatalie.livejournal.com]

Can anyone recommend exterior window cleaning services for higher-than-ground-level? Several years ago when I rented in Somerville there was a group that would do a great job, and you paid by the window, something like $3-4/window. But they would only come out if there were a couple of houses doing it, to make it worth their while with bringing ladders and such. They were really nice and once they were in front of the windows, they did whatever other little window maintenance things they came across for free, as well. I only need ~10 regular sized windows done, but I could try to find neighbors if that's the norm.