Shipping is unavailable from December 27th to January 2nd. Please understand this before making a purchase. ******************** Used once a day for about six months. I have disassembled and cleaned it as much as possible, but due to the nature of the product, which cannot be washed with water, some residual powder may remain. Please understand this beforehand. The entire unit has been wiped down with disinfectant alcohol. This is for the main unit only. Non-smoking, pet-free environment.