The persistence of armpit smell in old t-shirts, despite washing, can be attributed to several factors. Here are some possible reasons:
Bacteria buildup: Over time, bacteria can accumulate in the fabric of old t-shirts, particularly in areas such as the armpits where sweat and oils tend to be concentrated. These bacteria produce unpleasant odors even after washing. Washing alone might not be sufficient to completely eliminate the deep-seated bacteria.
Residual sweat and oils: Sometimes, regular washing may not completely remove all traces of sweat and body oils from old t-shirts. These substances can contribute to the persistence of odor even after washing.
Inadequate cleaning methods: If the old t-shirts are not washed properly, the odor-causing bacteria and sweat residues may not be effectively removed. It's important to use an appropriate amount of detergent, follow the garment care instructions, and wash at the recommended temperature to ensure thorough cleaning.
Fabric quality and wear: Old t-shirts may have undergone wear and tear, leading to fabric deterioration. Over time, the fabric can become more porous, making it harder to eliminate odors completely.
In contrast, new t-shirts typically haven't been exposed to as much sweat, oils, or bacteria, and their fabric is generally in better condition. Therefore, they may not develop strong odors even after washing.
To tackle persistent armpit smells in old t-shirts, you can try the following:
Pre-treat the affected areas: Before washing, apply a stain remover or a mixture of baking soda and water to the armpit areas of the t-shirt. Let it sit for some time before laundering.
Use enzyme-based detergents: Enzyme-based detergents are effective at breaking down organic compounds, such as sweat and oils. Look for detergents specifically designed for removing odors.
Wash at higher temperatures: Hot water can help kill bacteria and remove odor-causing substances. However, ensure that the fabric and care instructions allow for higher temperature washing.
Soak in vinegar: Add a cup of white vinegar to a basin of cold water and soak the t-shirt for a few hours before washing. Vinegar can help neutralize odors.
Try baking soda: Add half a cup of baking soda to the washing machine along with your regular detergent. Baking soda has odor-absorbing properties and can help eliminate smells.
If you've tried these methods and the armpit smell persists, it may be time to consider replacing your old t-shirts, as prolonged use and repeated washing may render them difficult to deodorize completely.