1. Apply cleaner: If the bag is leather, apply leather cleaner on the dirty side of the bag. If it is not genuine leather, toothpaste can be used instead. If it is not very dirty, you can also use detergent.

2. Infiltrate dirt: wait three to four minutes for the place coated with leather cleaning agent, and then wash it after soaking in dirt.

3, brush with a brush: choose a soft brush, you can also use a soft toothbrush. If toothpaste is used, brush it with water. Don't brush too hard, brush gently and brush several times.

4. Use a light-colored cloth or towel, preferably white, to clean the area that has just been brushed on the surface of the bag.

5. Dry: Put the cleaned bag in a cool place indoors and wait for it to dry slowly. Don't directly bask in the sun, it will damage the bag.