Deerskin slippers are meant for indoor use and are washable. They are not treated, leaving the leather naturally soft and luxurious.
To hand wash: fully emerge in cold water. Use a mild detergent, similar to what you would use for a delicate item of clothing. Hand wash and rinse well with cold water. Hang slippers to dry.
To machine wash: using the gentle cycle on your washing machine, use cold water and a mild detergent, similar to what you would use for a delicate item of clothing. Similar colour items can be added, like towels. Hang slippers to dry.