We cleared the stopped-up front sunroof drain tubes on daughters' Lexus and Jetta (a week before she totaled it) with a can of compressed air. We put the can's straw in the drain hole, wrapped a small piece of wet paper towel around the straw, used a small screwdriver to pack and seal the paper towel against the straw and drain hole, then gave a couple of blasts and cleared the drain tubes. Could hear the water draining out. Got the can of air in the computer section of walmart. It's used for cleaning dust from keyboards and electronics.