Fill your bathtub or utility sink with warm water and just enough delicate laundry detergent to create suds.
Gently rub the fabric together and work it into the suds until the entire shirt is lightly lathered.
Rinse the shirt with cold water directly under the spigot until the water that flows off it is clear and free of suds.
Hang the shirt to dry over a laundry drying rack, a clothes hanger over your shower curtain rod or on a clothes line. Wringing the shirt will ruin its shape and placing it in the dryer will ruin the sheen.