First of all, consider just airing the garment, instead of washing it. If you still desire to wash it, here are some guidelines:
Hand wash at 30ºC - separately - with wool detergent without enzymes or optical brighteners.
Don’t let the garment soak. Move the garment gently back and forth, do not rub or squeeze it.
Rinse the garment until the rinse water is completely clear, making sure the water temperature stays uniform.
Do a light centrifugation of the garment (about 800rpm), choosing a program that DOES NOT take in water at the start. Or press carefully the water out of the garment with a dry towel. The garment shouldn’t be twisted or rolled.
To dry the garment, shape it and lay it flat - do not hang - ideally on a warm bathroom floor or on top of a drying rack in a room with good air circulation. Never dry the garment in direct sunlight.
Don’t tumble dry.
Note: If you are washing a project made with this yarn combined with another, the general guideline is to follow the washing instructions for the most delicate of the yarns you are working with.