You need 2 cups of warm water and 2 teaspoons of baking soda. You should also take an old toothbrush and a soft cloth. You can use a little dishwashing liquid if required. First, you must mix the baking soda well into a bowl of warm water. You can add some dishwashing liquid if the seal has too much dirt.
Next, you dip the old toothbrush into this mixture. You scrub the rubber seal folds and gaps gently. You should pay special attention to areas with heavy dirt and black spots. You must wipe the entire rubber with a clean wet cloth after scrubbing. Finally, you wipe the seal again with a dry soft cloth to remove all moisture. You must prevent the moisture from staying there for a long time.
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