1. Dampen the stain and rub with laundry soap. Soak in a solution of laundry detergent for 30 minutes or overnight.
2. Rinse thoroughly
3. Wash normally
If the perspiration has changed the colour of the fabric, you may be able to restore it by rubbing a little white vinegar on an old stain.
Before cleaning the stain, check the label for care details of the stained garment, and always conduct a test on a hidden area of fabric.