If your washing machine starts smelling bad and simply running water through it doesn't solve the issue, there are several steps you can take to clean its inside effectively:
Inspect the drain pump filter: The bad smell could be due to a clogged or dirty drain pump filter. Check your washing machine's manual to locate the filter and clean it. Make sure to turn off and unplug the machine before attempting this.
Clean the detergent dispenser: Remove the detergent dispenser tray (if applicable) and wash it thoroughly with warm, soapy water. Sometimes, detergent and fabric softener residue can build up in the dispenser and cause unpleasant odors.
Run a hot water cycle with vinegar: Fill the washing machine drum with hot water and add two cups of white vinegar. Vinegar is a natural deodorizer and can help dissolve soap scum and other residues. Let the machine run through a complete wash cycle without any clothes in it.
Baking soda treatment: After the vinegar cycle, sprinkle a cup of baking soda in the drum and run another hot water cycle. Baking soda helps to neutralize odors and further clean the inside of the machine.
Wipe down the drum and door seal: While the washing machine is empty, use a damp cloth soaked in a mixture of water and vinegar to wipe down the drum and the rubber door seal. These areas can trap moisture and develop mold or mildew.
Leave the door open: After each wash, leave the washing machine door open for some time to allow air circulation and prevent moisture buildup.
Use washing machine cleaning tablets or powder: You can find specialized washing machine cleaning tablets or powders in stores. Follow the instructions on the package to clean your machine effectively.
Check for hidden areas: If your machine has a removable detergent drawer, fabric softener compartment, or any other removable parts, check them for hidden dirt or debris.
Regular maintenance: To prevent future odor issues, follow a regular maintenance routine. Clean the detergent dispenser, door seal, and filter regularly. Also, avoid using excessive detergent and fabric softener, as they can leave residues in the machine.
By following these steps, you should be able to clean your washing machine's inside and get rid of the bad smell. If the problem persists, you may want to contact a professional appliance repair service for further assistance.