- 1). Dampen a piece of burlap with water, and cover the sponge. Leave your sponge under the burlap for several days, or until the outer skin has rotted off. You might want to place the sponge outside during this time because it will smell.
- 2). Put on a pair of rubber gloves, and rinse the sponge under running water. Squeeze the sponge to remove any non-skeletal debris that might still be inside.
- 3). Fill a container with rubbing alcohol, and place the sponge inside. Close the lid to the container, and let it sit for 48 hours.
- 4). Remove the sponge from the alcohol, and place it in a sunny spot to dry completely. The cleaned sponge will be a light color, full of open pores, and will lack any remnants of the dark outer skin.
- 5). Store your sponge in a dry environment to preserve it.
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