You can remove yellow stains from sweat and deodorant by turning the garment inside out and pre-treating it with Marseille soap. Rub well, let the garment soak for 15 minutes and proceed to the usual wash.
How to remove old sweat stains?
Old sweat stains on a white garment can be removed with sodium percarbonate. Wet the area, apply the percarbonate and let it sit, then wash the garment as usual.
Why do white t-shirts turn yellow under the armpits?
T-shirts always form yellow stains under the armpits, whether due to sweat or the use of deodorant.
How to remove yellow sweat stains from cotton?
If there are yellow stains on cotton shirts, try dabbing it with hydrogen peroxide, let it act, and then wash the garment in the washing machine.
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