1. The black spots on the schoolbag are mould spots. Put the mouldy bag into the rice washing water and soak it overnight to let the remaining protein absorb mould. The next day, the color of the rice water became darker, and the mildew had been removed.
2. For areas where mildew is still stubborn, apply 5% alcohol solution or scrub with hot soapy water for several times, and then scrub according to the routine, mildew can be completely removed.
3. Take 100 grams of clean ginger, mash it, add 500 grams of water into the pot, boil it for 10 minutes, then put the schoolbag into the basin and soak it for 15 minutes, then rub it repeatedly. The black spots can be eliminated, and then rinse the schoolbag with water.
