1. Brush shoes with washing powder, wipe them clean, and control the water to dry. Spread toothpaste evenly on the surface of shoes and dry it in the shade.

2. Brush the shoes with washing powder, drop two or three drops of blue ink into the water when washing the shoes for the last time, and then soak the shoes for five minutes. This method also applies to all white clothes.

3. Wrap the brushed white sneakers with toilet paper and put them in the shade to dry.

4. White painted shoes usually turn yellow due to the deposition of stable substances, such as some stains and sweat marks. First, try to use neutral detergent when brushing shoes (toothpaste is a good choice). When washing dry, you can wrap your shoes in white paper (preferably white toilet paper). When the shoes are dry, you will find that there are no yellow marks on the shoes, but there are many yellow marks on the toilet paper. If your shoes have turned yellow, you can buy lead powder in the shop.