It is recommended to use an antimicrobial soap and warm water and hand washing your sandals thoroughly. Please, do not machine wash them. To remove dirt or other build up from the grooves in the top soles or out soles, try using a soft bristled brush, such as a dish brush or old toothbrush, to gently scrub away any debris. You can carefully bend the shoes to open up the grooves and allow for water to clean deeper.