Material preparation: a cup of rice washing water, detergent, a cup of tea, scouring pad and water.

Step 1: Pour a cup of rice washing water into the washbasin (rice washing water has cleaning function).

Step 2: Then pour a cup of tea into the basin (tea has the function of removing odor).

Step 3: Then squeeze a proper amount of detergent into the basin (detergent has the function of cleaning and decontamination).

Step 4: Then carefully wipe the stains on the washbasin with a scouring pad.

Step 5: Wash the washbasin with clean water.

Step 6: The stain on the washbasin has been removed.