A simple yet effective cleaning solution is vinegar, which can break down mineral deposits. Close the bottom of the tank, fill the hot water heater with vinegar, about a quarter of it using the cold water supply, and let it sit for several hours. Then, reopen the drain valve and let the vinegar drain out through your garden hose.

If you have a vacuum cleaner, use this to remove thick layers of dust and grime on the outside of the water heater tank. A crevice attachment will help you clean the bottom of the tank. Make sure you also vacuum the area behind the heater, as well as the spots around the pipes. Next, use a clean, dry cloth to wipe down your heater.