Cleaning the stains on leather goods requires preparation: leather bags, toothpaste, paper towels and toothbrushes. The specific operation steps are as follows:

1. First, open the toothpaste, take a proper amount of toothpaste and smear it on the stain on the leather bag, as shown in the figure.

2. Take out the toothbrush below and dip it in toothpaste to brush the stains on the leather bag, as shown in the figure.

3. Take out the paper towel below and wipe off the stains on the brushed leather bag, as shown in the figure.

4. Finally, the stains on the leather bag will be removed. Just look at the effect shown in the picture below.