The insoles of uggs on sale absorb a large amount of the sweat from feet. On a regular basis the insoles should be removed, wiped over with a damp cloth and left to dry naturally. Insoles will last a long time, but should be cleaned regularly to prevent the buildup of bad odors.
Mix together equal amounts of distilled water and vinegar and soak a sponge in it. Starting from the bottom of the sheepskin, scrub the inside of the shoe. The sponge should be wrung out on a regular basis and have additional cleaning mixture applied to it. Once the cleaning is complete use a sponge and just distilled water on the sheepskin to remove the vinegar smell.
Combine equal amounts of baking soda and corn flour and sprinkle inside the boots. A tablespoon of each will be enough for one boot. Leave the mix in the ugg boots on sale overnight and pour out the excess powder.
Never put Ugg boots in the washing machine. This works with sneakers, but will ruin the sheepskin lining of Ugg boots. Regular airing of your Ugg boots outdoors is the best way to stop nasty smells building up.