Time passes, and it shows on your clothes. Having changed from a bright white to an old off-yellow, they are witness to repeated washing and other factors responsible for tarnishing. You must react! Thanks to this natural and effective technique, give new life to your white clothes. You only need one ingredient: baking powder (20 to 30 grams).
The technique is very simple: wash your white clothes normally, then soak them in a basin of water with 2 or 3 sachets of baking powder. Leave to soak for a few hours or overnight. Rinse clothes, wring and dry as normal. They will regain their whiteness as on the first day, without effort and without risk to your health.
Here is another method that is also very simple and effective: see here.
Source: Tips guide