Excuse me, what kind of washing can make the sheets white, and the leaflets will turn yellow after soaking? Is there a good detergent suitable for washing sheets?

When washing clothes, you can add some soda ash, soak for a while, and then wash, you will find it whiter. This only applies to cotton bedding.

Just soak it in disinfectant. The supermarket sells that bleach. You can look at the white cat brand, cheap, big bottle. When you look at it, you will slowly see the process of clothes turning white. Ordinary clothes will take about 5 minutes, but it is not good to soak for too long.

When I wash white pants or clothes, I will drop a few drops of pure blue ink, and the clothes will turn white after soaking for 5 minutes.

Yours is wasting ink to make sheets.