How To Get Rid of Yellow Armpit Stains--- 1 tsp dawn, tsp hydrogen peroxide, TB of baking soda. Mix together. Use small laundry brush and scrub it in. Let it stand for approx 1 hour and then launder as usual. ( instructions copied from this pin)
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This really works! - Remove deodorant stains with dryer sheets. Rub the marks in a circular motion and the sheets will absorb the deodorant. Make sure there's no excess lint from the dryer sheet or you'll end up with gray marks.