It might sound a bit contradictory, but a dishwasher needs to be cleaned too. Over the years a lot of dirt and tiny bits of food can cling together in the corners of a dishwasher. It not only looks bad, but it can also create unpleasant odors. How to clean dishwasher – simple instructions Step 1: check the drain It’s no surprise that the drain can get clogged up very easily. Check to see if there is dirt blocking the drain. Step 2: clean the dishwasher inside Empty your dishwasher