How can I keep wet snow from building up under my windshield wipers?
First, try applying one of those glass treatments such as Rainx, they help to some degree. Next, try keeping the windshield cool. That means avoid running the defroster on heat. If the windshield stays cool, the snow won't melt and stick when it lands on the glass. To keep the windows from fogging up, keep the windows open slightly. This will actually improve the air flow in the cab, and you will stay warmer than you would with the windows closed.