Washing machine, put all the clothes in a bag: the old trick of our grandmothers

Solve without a washing machine with the bag method
If your white clothes tend to yellow, all you have to do is get some ingredients that we are sure you already have at home. We are talking about hydrogen peroxide, a classic clothes soap and salt.

Create a mix of peroxide and salt in a basin of water, where you will immerse some of the white clothes that you notice have yellowed. At that point you can proceed by passing the clothes soap along the parts where you notice the most yellowness.

Washing machines
Now take the clothes, wring out the water well and, without rinsing, put all the clothes inside a single bag. Proceed, trying to create a sort of vacuum. Then, remove as much air as you can from the bag and let the clothes rest inside.
Leave it to act for at least an hour, then rinse and hang the clothes out to dry. If you want to do an extra step, to be safe, put the clothes in the washing machine and do the wash you usually apply.
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You will notice how your clothes will become truly white as they have never been and you will eliminate every trace of yellow. You probably did not know this trick, yet it is really effective with clothes of any color, but especially with white ones.