Well, you put it in the washer, add some soap, and watch it shake 'n bake.
If you really want to avoid shrinkage and help retain the longevity of color and print, hand wash with cold or lukewarm water, then hang dry. Otherwise, follow the instructions below for machine wash or give it to your mother. She will know what to do.
1. Flip clothing inside out.
2. Separate color clothes from whites.
3. Wash cycle with cold or warm temperature.
4. Use mild or natural laundry detergent.
5. Set dryer to low heat as it offers a gentle option and helps extend clothing life.