The natural properties of merino wool repel dust and make garments impervious to dirt. There is therefore no need for them to be cleaned too frequently, which not only saves money, but also helps the environment.
Place the item in a mesh bag. Machine wash cold.
Use the delicate cycle. Never use the spin cycle.
Dry flat on a towel, reshaping the garment. Iron on high steam to bring it back into shape.
Wash and iron inside out.
Do not dry clean. Do not bleach.