The process for removing a sweat stain from a shirt varies slightly depending on the fabric of the shirt. Generally, applying water and some household cleaning products to the sweat stain should remove it. Do not iron the clothing, as this causes the stain to set in the fabric. For cleaning fabrics such as linen and cotton, you may need an enzyme presoak product, such as the commercial product Shout, as well as water, a sponge, white vinegar and ammonia. Treatment of the stain should take about 30 minutes to an hour.Continue Reading
Use the presoak product according to package instructions, and then soak the article of clothing. Launder the clothing once it is done soaking. Prompt treatment of sweat stains is important, since the sweat weakens the fibers of the clothing, and older stains are harder to remove.
If the stain is older, dilute some white vinegar with water, and apply the solution to the stain with a sponge. Afterward, launder the article of clothing.
If the fabric is discolored, fill a bowl with ammonia. Dampen the clothing, and stretch the stained part of the clothing over the bowl.