When you need to clean, you can use a toothbrush to brush the bottom of the two sides. If you can't brush, you can insert toilet paper and get a small amount of water. Then you can rotate the toilet paper with a toothbrush so that the scale can be cleaned. Then you can wash it with vinegar or salt water for a while and then wash it off
White vinegar and dishwashing liquid in the water. Soak baking soda for more than half an hour. Then rub it on again with a steel ball, then rub it on again with 84 disinfectant, and finally rinse it with water