This, to which you can also add lemon juice , should be placed on the stain and allowed to rest for a few minutes in the sun, then rubbed with a toothbrush or sponge so that the stain disappears completely.
During this operation we must be very delicate, since if it is light fabrics they could break, so be careful and we will see that our stains, even the most stubborn ones, will be swept away.
There are also other methods on the web to remove stains, depending on their nature, but this method is the most effective due to the whitening properties of baking soda.
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