Remove the fleece lining from the Crocs.
Fill the sink with warm water. Add a capful of mild detergent. Stir with your hand to blend.
Add the fleece linings to the sink. Let soak for 15 minutes.
Gently rub the liners together to loosen dirt and clean the fibers.
Drain the sink. Rinse the liners under warm running water.
Press the liners against the side of the sink to remove as much water as you can; do not wring. Hang or lay flat to dry, then replace and wear as usual.