A trick as simple in its application as it is little known, for which you will only need an iron and talcum powder.

Sprinkle talcum powder on the yellowish areas of the garment, then hold the hot iron close to the garment for a few seconds, without resting it. The idea is to get the heat of the iron, but without letting it come into contact with the garment.

After applying heat, pass the iron over the stain. Just leave it for 2 or 3 seconds to whiten the garment. Finally, shake the garment to remove the talcum powder.
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Using aspirin
To remove yellowish stains from under the armpits you can apply the aspirin method. It is a very simple trick, which consists of putting one or two aspirin tablets in the washing machine drum.

The fizz of the aspirin will help remove sweat stains.

Cold water and hydrogen peroxide
Another effective method for removing yellowish stains from white clothes is to soak them in a solution of cold water and hydrogen peroxide.

After a couple of hours you can wash the garment normally. If the stain does not come out, you can use hydrogen peroxide directly, without mixing it with water.