Under Armour is a popular clothing line designed for use among active people, from professional athletes to casual exercisers. When you wear your Under Armour during physical activity, it will probably come into contact with your sweat. Sweat has certain proteins that may turn your clothes an unwelcome yellow color. Luckily, you can try several methods to return your Under Armour to its original color.
Things You'll Need
Enzymatic laundry detergent
Avoid using bleach when dealing with sweat stains on your Under Armour. Bleach reacts with proteins in your sweat and can actually darken sweat stains instead of remove them.
Soak the areas that are discolored with an enzymatic laundry detergent. Look for detergents that specifically cover removing sweat or sweat proteins on the packaging. Pour the detergent directly onto the affected area and let sit for 15 to 30 minutes, or for more serious stains. Let air dry for most of the day. Wash the Under Armour in the washing machine with cold water and let air dry.
Mix equal parts hydrogen peroxide and water. Pour the mixture directly onto the stained area of the Under Armour, or soak the clothing in the mixture for 30 minutes. Hydrogen peroxide breaks down the protein in sweat, helping wash it out easier. Stick the clothing in the washer with a cold water setting and let air dry. Repeat this until the clothes reach their original shade of white. Increase the amount of hydrogen peroxide if necessary, all the way up to a 100 percent solution for serious stains.
Use a mixture of 1 tablespoon white vinegar with a half of a cup of water. Pour the solution directly over discolored areas of your Under Armour and let sit for 30 minutes. Wash the clothing using cold water and let air dry.
Purchase a commercial cleaner such as OxyClean or boric acid, commonly sold under the brand-name Borax. Follow the directions carefully on the packaging of the product to ensure the clothing is cleaned correctly and adequately. For stubborn sweat stains, mix the OxyClean or boric acid with a little bit of water to create a paste. Take an old toothbrush and use it to work the paste into the stain before placing the clothing in the washer.
Do not mix your Under Armour with colored clothing in the washing machine as some of the cleaning methods -- such as hydrogen peroxide -- may not be safe for use on colors.