Baking soda, dish detergent and hydrogen peroxide can be mixed and applied directly to whites and colorfast clothing to remove perspiration stains. Difficult stains may require soaking overnight, while minor stains can be removed in a few hours.Continue Reading
Mix ½ cup of hydrogen peroxide with ¼ cup of liquid dish detergent.
Apply a small amount of the peroxide mixture to a hidden seam, and allow the garment to soak for 30 minutes. Rinse the treated area and examine it to determine the garment's colorfastness. If there is no visible color change, the garment can safely be treated with peroxide.
Pour the peroxide mixture directly onto the stain, then sprinkle baking soda over the area. Work the cleaning agents into the clothing gently, then allow the garment to soak for 30 minutes. Rinse the garment, and examine the stained area to see if the discoloration is visible. Retreat the garment as needed. Very difficult stains may require soaking overnight.
Launder the shirt as recommended on the care label. If possible, wash the garment in hot water. Dry the shirt in a sunny location outdoors to aid in removing the sweat stain.