How To Clean Rv Water Lines Out If it will be awhile until you use your Weekend Warrior Toy Hauler again, or your water is starting to taste musty, it is time to drain the water lines, and possibly sterilize the system. Draining the water is a simple job. Here's how to go about it: The first step is to drain the water heater. Go to the outside compartment where the water heater is located. Make sure all power to the water...... Similar Editorial : Specifying Delay Lines by Paul Alessandrini. | Source : Bigfoot Truck Camper