1. It is recommended to use detergent and toothpaste to clean the yellow stains on the white porcelain bowl. It is necessary to apply detergent or toothpaste to the yellow stain, wipe it by hand or with the help of a dish cloth, then rinse it with clear water and dry it.

2. The yellowing of the white porcelain bowl may be due to the bowl not being cleaned, oil stain or detergent residue, or the quality problem of the bowl itself.

3. If you clean a cracked porcelain bowl, you should prevent stains from infiltrating into it. It is suggested that you can brush your teeth with a toothbrush dipped in white vinegar.

4. When cleaning porcelain in winter, it is necessary to control the water temperature to prevent the porcelain from bursting due to alternating hot and cold.