1. Fill a sink or basin with lukewarm water.
Avoid hot water — it will only tighten fibers more.
2. Add baby shampoo or gentle conditioner.
Use about one tablespoon per liter of water. This relaxes the fibers.
3. Soak the shirt for 20–30 minutes.
Let the fibers fully absorb the mixture.
4. Gently remove excess water.
Press the shirt against the side of the basin; don’t twist or wring.
5. Lay flat on a towel.
Roll the towel with the shirt inside to remove more moisture.
6. Stretch carefully.
Lay the shirt flat on a dry towel and gently pull it in all directions to restore the shape. You can use pins or paperweights to hold the size while drying.
7. Let it air dry naturally.
Do not use heat — it will reverse the process.