One of our company trucks has a piece of anodized metal tubing that can be wrapped like a coil around a cooling/heating line going to the heater coil. As the engine warms up, the fluid heats up and defrosts the line and sprays really warm water on the windshield, which not only defrosts the washer nozzle but also defrosts the windshield. It works incredible.... I've been trying to find one forever!!
