What you need:
20 g of boric acid (2 sachets of 10 g)
10 litres of water
How to do it:
Dissolve 2 sachets of boric acid in 10 litres of water. Mix thoroughly until completely dissolved.
Soak the clothes in this mixture for about 2 hours.
After this time, wash your clothes as usual - the stains will disappear and the white will return to its place!
Method 2: Magic Mixture of Potassium Manganese and Detergent
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This is a slightly more advanced method, but its effects are worth every minute you spend preparing it. Potassium manganese, commonly known as potassium permanganate, has whitening properties and, when combined with detergent, works wonders on white fabrics!