A warm rinse is often enough in normal use. Machine wash regularly at med temp using little detergent. Rinse well. If too much detergent is used performance may be reduced, in which case hot wash with no detergent. Cloth will benefit from periodic hot wash at high temp or sterilizing by boiling in water. Tumble or hang dry. DO NOT use bleach which damages the fibers or fabric conditioner which inhibits performance. If used rewash with a little detergent. Color may run. Wash new cloths separately
