Material preparation: a pot of boiling water, detergent, white vinegar, toothbrush and chopsticks.

Step 1: Pour an appropriate amount of white vinegar into the boiling water basin (white vinegar has the function of sterilization, which contains acetic acid and has the function of removing odor).

Step 2: Then squeeze a proper amount of detergent into the basin (detergent has the function of cleaning and decontamination).

Step 3: Then stir the solution evenly with chopsticks.

Step 4: Soak the part of the thermos cup with the apron in the basin for 10 minute (boiling water has bactericidal effect).

Step 5: Then carefully brush the rubber ring on the thermos cup with a toothbrush.

Step 6: Finally, rinse the apron of the thermos cup with clear water.

Step 7: The dirt and strange smell of the thermos cup apron have been cleaned.