Put synthetic textiles into the Guppyfriend washing bag—filling up to ⅔ of the bag so clothes are still able to move around inside. Wash your clothes as usual, avoiding hot water (max temperature 104 degrees). Take out your textiles after washing. Do not tumble dry clothes in bag. Remove the released microfibers from the upper corners inside the bag and dispose of them properly (i.e. in a small container in the trash).