The first dishwasher was invented in 1892. Having grown tired of clumsy servants breaking her dishes, Josephine Cochrane rigged a copper pot with stiff brushes and a motor. It worked so well she showed it at the 1893 Chicago World's Fair, and won first place. Today, most homes have one, but unlike other appliances, the less you use it the more likely it is to break down. Water that remains in the bottom of your dishwasher is there for a reason. It keeps seals moist. This prevents leaks and protects the motor. But when it's not used for long periods, the water evaporates, seals dry out, and leaks and motor problems become likely. To prevent this, when a dishwasher will sit unused for more than two or three weeks, pour in a half-cup of liquid bleach to prevent bacterial buildup. Then, add three tablespoons of mineral oil. It coats the surface of the water and prevents evaporation, even over long periods of time. With dishwashers -- use it or lose it or protect it. And that's the On The House tip for today.