The Karcher Power Squeegee; It does windows!
One of our American Tug owners showed me this device, I had just finished the Seattle Winter Boat Show where I had spent each morning detailing the cockpits of the boats prior to inviting another days group of show attendees aboard. This would ease my morning ritual of using a chamois to rid the cockpit of the morning dew, towel drying the nonskid so folks did not get wet feet or track water into the boats, and removing excessive condensation from the pilothouse windows on very cold days.
It should work equally well on fiberglass or window glass, bonus for us boaters!
Karcher is a German manufacturer of high quality pressure washers, commercial and residential cleaning equipment.
Available from Amazon, click here. About $45.