If the shoes are oxidized to yellow, you can brush the oxidized yellow part of the shoes with water, then paste toilet paper and put it in the sun to dry. Shoe oxidation is a chemical reaction. Preventing shoes from contacting with air directly can prevent shoes from turning yellow.
Most of the color of oxidized yellow shoes is white, because chemically, white is easy to react with direct sunlight. If the white shoes are exposed to the sun for a long time, they will be easy to oxidize yellow.
Clean white sneakers and pay special attention to drying. After cleaning the sneakers, wrap a layer of clean toilet paper on the surface of the sneakers to prevent sunlight from contacting the white surface of the sneakers, so as not to make the sneakers yellow.
If you don't wear shoes at ordinary times, wrap the shoes with bags and other things and put them in a dry and cool place. Don't let the shoes come into direct contact with the air and sunlight, so as to prevent chemical oxidation reaction and cause the shoes to turn yellow.