How to prevent white sheets from yellowing when hanging them in the heat

Sodium percarbonate
Finally you can opt for sodium percarbonate!

Although the standards are similar to those of bicarbonate, the cleaning and whitening action of percarbonate is stronger and in fact it is used exclusively for clothes with stubborn stains.

In addition, percarbonate must be used in a wash at a temperature of at least 40°, otherwise it will not be completely effective.

You will need to put 1 tablespoon directly into the washing machine drum or detergent drawer.

Warnings
We recommend that you always read the washing labels to avoid damaging or further staining your clothes.