Many people forget to clean it: This is how the washing machine rubber becomes hygienically clean. Dirt, lint, hair or even small objects such as hair ties or coins that have accidentally gotten into the laundry tend to collect here.
If you find mold while cleaning the rubber seal, you can simply remove it with vinegar. If the rubber is more dirty, certain home remedies can help you clean the rubber thoroughly: Mix baking soda or baking powder with a little water to form a paste and spread it on the rubber.