Fill a clean bowl with warm water. Add a few drops of a mild dish soap. Use a soft bristle nail brush to mix the water and soap together.
Dip the edge of a soft cloth into the soapy water. Dab it onto the lambskin leather in an inconspicuous spot to test if the color of the lambskin will bleed. If the color transfers to the cloth, do not proceed with cleaning the lambskin on your own--seek professional cleaning services.
Wet your soft bristle nail brush in the soapy water. Tap it on the edge of the bowl to shake excess moisture out.
Scrub your lambskin leather gently with the soft bristle nail brush. Scrub with the grain of the leather.
Rinse the lambskin leather with clean water. Do this by wiping it with a wet soft cloth that has been wrung out.
Absorb excess water from lambskin leather by wrapping the item in an old bath towel. Stretch the item to its natural shape and put on a hanger if necessary. Leave the item to air dry away from sunlight or any direct source of heat.
Brush the item with a nylon bristle brush after it is dry to restore the nap if needed. Apply a water repellent and stain guard after the item is completely dry.