I have struggled with different products to get snow off the Satellite dishes with no success. Sprays, heating elements when near an electrical source, cooking sprays, etc etc. For Christmas I received a snow visor specifically for sat dishes. Haven't tried it yet with snow but it has to be better than what I've been using. For you fellow sufferers who have to walk to the dish (or climb ladders) every hour to clean off the dish to see Judge Judy here is the link. http://www.ebay.com/itm/Satellite-Dish-Snow-Visor-TM-for-Oval-Antennas-/270695744151?hash=item3f06b9...
I would have a couple of concerns with that.
One would be added "windage". Even a small amount of movement will affect your signal. The second area of concern is in "Look Angle" .... the signals travel in the area of 30-45 degrees above the level of the dish arm.
My solution was to buy from Lowes a 16' collapsible extension pole and screwed a 8" brush on the end.