Have had these guys do both Gutter Cleaning and Window Washing. They were fast, responsive, reasonably priced, did good work, and didn't try to bilk me (e.g. told me to get my gutters cleaned LESS often).
I've had Clear Skies back multiple times now for window cleaning, gutter cleaning, dryer vent cleaning, and gutter repairs. They're professional, efficient, and friendly. I highly recommend them!