How can we keep white canvas shoes from turning yellow?

This is what my grandmother taught me ~ ~ ~ First, wash the shoes, and then evenly spread the upper with toothpaste, focusing on the edges of the shoes. After that, wrap the shoes with toilet paper and put them in a cool and ventilated place to dry. Be careful not to expose them to the sun. Shoes treated in this way will not turn yellow. Brushing shoes with toothpaste is not easy to turn yellow.

Wrapped in white toilet paper, it is not easy to turn yellow. It is best to ventilate and dry, not under strong light. ...

How can I keep white shoes from turning yellow? A: After drying, you will find that the paper towels on the shoes turn yellow and the shoes are white. White shoes get dirty easily, so be sure to put paper towels when drying them. Instructions on wearing, cleaning and maintenance of sports shoes

Clean your shoes regularly, gently wipe them with a damp cloth (be careful not to use too much water), squeeze some toothpaste on them where there are too many dirty things, and then clean them with a toothbrush. Dry the vamp when cleaning, and don't brush it with a brush. ...