It is recommended that you pretreat the fabric and threads by soaking them in a mixture of 75% white vinegar and 25% water to set the colors for at least four hours. Some of the colors may bleed if not.
Hand wash (for persistent stains, use a mild detergent)
Rinse thoroughly after hand washing
If you must use the washing machine, use the gentle cycle on cold and flip the garment inside out.
For best results, lay the smocked outfit flat to air dry