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Despite your best efforts to repel it, sweat happens. When armpit odor strikes your shirts, getting it out ranges from a simple pre-treatment and washing to an overnight ordeal. While dry-clean-only garments should always go to the dry cleaner, you've got options when it comes to washing many types of shirts, including your tees, at home. With a little elbow grease you'll have your shirts back, odor-free.
Soak your smelly garment in an enzyme pre-soak product. Follow the instructions on the product label for how much to use and soaking time. Alternately, apply liquid laundry detergent directly to the armpit area. Work the detergent into the armpits with a soft-bristled scrub brush, and use a bit of water to emulsify the detergent.
Wash your shirt in the washer with liquid laundry detergent. Use warm or cold water but avoid hot, as heat can set sweat stains into the fabric for life.
Give your shirt the sniff test post-wash. Can you still smell the sweat? If not, dry your garment in the dryer or hang it to air dry.
Soak a still-stinky shirt in a solution of warm water and salt, using 3/4 tsp. of salt per quart of water. Add enough water to fully immerse the shirt in the salty solution. Let the shirt marinate overnight, then rinse out the salt. Sniff the shirt. If the odor's gone your work is through; if not, proceed.
Apply liquid laundry detergent to the armpit areas using your scrub brush. Let the detergent soak for 30 minutes. Wash as normal.
Re-launder the shirt using the same temperature water as you did before. This extra care should remove the unpleasantness.
Air dry or launder your shirt in the dryer. Once the smell's gone, heat's no threat to your garment.
If you need to vanquish the smell but don't have time to do laundry, spray your garment with linen spray. This scented spray overrides odor to leave you smelling fresh.
Always use deodorant or antiperspirant under your arms to cut down on odor issues.