Once you've found it, loosen the pipe clamp and carefully disconnect the hose. Use a damp cloth to clean and wipe around the filter. Advertisement. The dishwasher shares a drain with the kitchen sink, so if you have a garbage disposal, run it before washing the dishes to ensure that the drain is clear. If your dishwasher is underperforming or not fully draining, there's probably a blockage somewhere. The drain hose is the tube that links the dishwasher with your garbage disposal. Method 3 of 4: Cleaning the Exterior. The first step in cleaning a dishwasher drain is to empty the dishwasher, remove the cleaning racks and dishwasher filter. 1. Before you start cleaning you dishwasher, it’s a good idea to quickly check the area around the drain. “How To Clean Dishwasher Drain” – And restore normal functions: Step 1: Clean Dishwasher Drain Filter . Start by removing any food waste that may be present at the bottom of your dishwasher. How to Clean a Dishwasher Filter. #2 – Fill the detergent and the drying-agent dispensers with white vinegar, then run the dishwasher empty on the pots-and-pans cycle — to keep the dishwasher drain lines clean and free-flowing. Take this opportunity to clean any dirt build up on the spray arm and the inside of the dishwasher door. Step 2 - Check the Dishwasher's Drain Hose. Try to blow through the hose to make sure it's clear. Safety first! Not only is this necessary for cleaning the dishwasher, but it also reduces the chances of slipping and falling while working around the dishwasher. In a small bowl, pour 1/4 cup (32 g) with 4 cups (950 mL) of hot water, then stir them together to form a creamy paste. (Because vinegar is a great de-gunking dishwasher drain cleaner!) Mix baking soda with hot water to make a cleaning solution. Note: If the hose is blocked, look for any kinks in the hose and straighten them. Inspect The Drain. You may have to pull the dishwasher out or locate it under the sink. Use the toothbrush and some soapy water to clean the drain located at the bottom of the dishwasher. 1. Find out where your dishwasher's drain hose is connected to the sink or the garbage disposal drain pipe. Check the Drain Hose. Remove and clean the dishwasher filter. Step 4: Perform a Check On the Drain Hose. Loosen the dishwasher drain hose clamp and disconnect the drain hose (usually it's the one with ridges) from the pump. Regularly cleaning the inside of your dishwasher is an easy way to help prevent odors and the build-up of detergent and minerals. Whether you use a dishwasher cleaning tablet or clean your dishwasher with vinegar and baking soda, repeat the following steps every 30 days to keep your dishwasher running efficiently and your family’s dishes sparkling clean. Remove the bottom rack for easier access, then feel the area around the drain. 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