To clean your Uggs, you'll need a mild sheepskin cleaner like Woolite or the UGG Autralia Sheepskin Cleaner, or you can also try using an all-natural cleaner that's safe for wool and other delicates. Be sure to dilute your cleaner in cold water according to the instructions

Next, use a cloth soaked in cold water to dampen the outside surface of your boots, being careful not to thoroughly soak through the entire sheepskin. Apply a small amount of your cleaner to a sponge, and gently scrub the entire area in small circles. For tough stains or hard to reach nooks, try using a toothbrush - just be careful not to damage the material. Rinse off all the cleaner with your cold, wet cloth, stopping to rinse and ring it out as you go.