Wool is self-cleaning. However, if periodic cleaning is required, your Glerups can be washed in the washing machine on the "wool", "hand wash" or "delicates" program (max 30 degrees C.).
It helps to vacuum or blow your shoes clean of dust before washing.
After a spin-dry put your feet into the wet shoes. Pat your Glerups into shape, remove, and leave to air dry. Your Glerups love fresh air.