Using an energy- and water-efficient dishwasher instead of washing by hand can actually save you about $40 a year, according to the Environmental Protection Agency. But like most household appliances, maintenance is key to making sure your dishwasher works properly for a long time. One issue is hard water, which can build up stains and deposits inside the dishwasher. Over time, it can restrict water flow and effectiveness of the dishwasher. The easy solution is white vinegar. Pour 2 cups into the bottom of the dishwasher and run it empty. It will eradicate hard water stains and also help neutralize any odors.