Top layer metallic foil may be damaged if treated with rough sponges brushes, harsh soaps or chemicals. Clean using warm water, mild soap and a clean soft sponge. Rinse well and air dry. Avoid cleaning agents that contain ammonia, household alcohol or other harsh ingredients. Machine washing and dishwasher use is not recommended. To sanitize, you may wipe with a weak chlorine bleach solution 1 part chlorine bleach, 10 parts water and a clean non-abrasive sponge or lint-free cloth. Rinse well and air dry.