In one word: delicately. Muay Thai shorts are made from delicate fabrics and feature intricate stitching. Some brands even include fragile materials that need extra attention when washing. As such, we always recommend hand washing Muay Thai shorts inside out with a mild detergent. Gently massaging the shorts before soaking for 15-20 minutes. Followed by air drying out of direct sunlight. Never tumble dry them, as it will degrade the materials and waistband.
For more details, check out our detailed guide on washing your Muay Thai gear.