Stiff fabric under the arms or around the collar is caused by sweat salts, deodorant residue, and detergent buildup. Regular washing doesn’t remove this — you need a targeted treatment. Here’s how to restore softness and remove sweat crust completely.
1. Why Sweat Builds Up and Hardens
- Deodorant + sweat mix creates a waxy layer
- Hard water causes minerals to bind to fabric
- Detergent residue traps sweat salts
2. Vinegar Pre-Soak
- Mix 1 cup white vinegar + warm water
- Soak T-shirt for 20–30 minutes
Vinegar breaks down deodorant compounds.
3. Baking Soda Scrub (Best for Stiffness)
- Make thick paste: 4 tbsp baking soda + water
- Apply to armpits or collar
- Scrub with soft brush
- Let sit 30 minutes
4. Hydrogen Peroxide Mix (Deep Clean)
- Mix 1 part peroxide + 1 part water
- Add 1 tbsp baking soda
- Apply to stubborn buildup
5. How to Prevent Sweat Stiffness
- Let deodorant dry before wearing shirts
- Use cold water only
- Add vinegar every few washes
- Don’t overload washing machine
6. Best Fabrics to Avoid Sweat Buildup
Choose natural fabrics:
- 100% cotton
- Bamboo
- Modal
Explore more:
– How to Remove Yellow Armpit Stains
– How to Remove Odors From T-Shirts
Final Tip: Sweat stiffness is reversible — the key is breaking down deodorant + detergent buildup.
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