Shake the shoes off over the trash or outside to help loosen any dirt that might be on or in the slippers.
Vacuum the shoes using the brush attachment from the vacuum cleaner to eliminate any dirt that might have become stuck between the fibers.
Mix a mild soap or wool detergent into warm water. Add no more than 2 tbsp. of soap to 1 quart of warm water.
Dip a sponge into the soapy water and wash the slippers. Wipe them inside and out with the sponge. Wring the sponge out before using it on the slippers to avoid saturating them.
Rinse away the soap by wiping the slippers with a damp cloth.
Set the slippers in a cool, dry place. If the weather is accommodating, set the slippers outside, but not in direct sunlight.
Sprinkle baking soda or table salt over the dry wool slippers and leave it for 12 to 24 hours to absorb lingering odors and moisture.