- 1). Lay a white towel or cloth on a flat surface to protect your work area and the white shirt. Make sure the area has ventilation and plenty of light.
- 2). Pour either ammonia or hydrogen peroxide into a bowl or basin. Add an equal amount of room-temperature water. Put the affected area of the shirt into the solution, and allow it to soak for 30 minutes. Either substance should work to loosen and dissolve the perspiration stain.
- 3). Scrub the perspiration stain gently with a toothbrush, to work the proteins and salts in the shirt loose from the fabric. Rinse well, and allow the shirt to dry.
- 4). Look at the dry shirt; if the yellow remains, heat half a cup of vinegar combined with 2 tablespoons borax. (Increase the ingredients as needed to provide enough solution for your needs.) Soak the perspiration stain in the solution for 30 minutes to an hour.
- 5). Use a toothbrush to scrub the sweat stains gently. Rinse well to finish, and let the shirt air-dry completely.
- 6). If yellowing remains, mix baking soda with enough water to form a paste the consistency of stiff frosting, but still spreadable. Rub the paste into the perspiration stain using a toothbrush to work down into the shirt fibers. Let the paste sit for a minimum of 30 minutes to allow the baking soda to work.
- 7). Rinse the stain completely, and allow it to air-dry.
- 8). If the stain remains, spread a liquid oxygenated detergent over the perspiration stain. Lay or hang the shirt outside, allowing the sun to bleach the stain.
- 9). Spray the stain occasionally with water -- enough to keep it wet. Scrub the stain with a toothbrush each time you wet the shirt. Continue for three to four hours, and finish by washing the shirt in cold water.
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