If detergent alone isn't sufficient to remove the mildewy smell from cotton T-shirts, there are several alternative solutions you can try:
White Vinegar: Add one cup of white vinegar to the washing machine during the rinse cycle. Vinegar is excellent at neutralizing odors, including mildew smells. It's safe to use on cotton fabric and won't damage the material.
Baking Soda: Sprinkle a quarter to a half cup of baking soda directly onto the mildewy-smelling T-shirts before starting the washing machine. Baking soda is a natural deodorizer and can help eliminate unwanted odors.
Hydrogen Peroxide: Mix one part hydrogen peroxide with two parts water and pre-soak the T-shirts in this solution for 30 minutes before washing them in the machine. Hydrogen peroxide can help kill bacteria and remove odors.
Lemon Juice: Lemon juice has natural antibacterial properties and a pleasant citrus scent. Squeeze the juice of one to two lemons into the washing machine along with your regular detergent.
Enzyme-based Cleaner: Look for enzyme-based laundry cleaners specifically designed to remove odors. These cleaners contain enzymes that break down organic matter, including the source of the mildew smell.
Sunlight: After washing, hang the T-shirts outside in direct sunlight to dry. Sunlight is a natural disinfectant and can help freshen up the fabric.
Ensure that you follow the care instructions on the T-shirt's label and avoid using hot water or harsh chemicals that could damage the fabric. Also, double-check that the mildew smell is entirely gone before placing the T-shirts in the dryer, as heat can set odors into the fabric.
Additionally, it's essential to prevent mildew growth in the future by ensuring the T-shirts are thoroughly dried after each wash and storing them in a well-ventilated area. If possible, avoid leaving damp clothing in a closed, dark space for extended periods, as this creates an ideal environment for mildew to develop.