What Causes Yellow Underarm Stains?

Answer

Yellow underarm stains are caused by perspiration and stains from the deodorant. The heat that drys the stains makes the color even worse and is hard to clean out. Sweat has traces of urine which is why the color of the stains are yellowish in color.
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Causes of Yellow Underarm Stains are not made by sweat alone. The sweat when mixed with the chemicals from deodorants produce the stains. ...
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