I always make sure that when it comes to wearing my UGG's never to wear them when its warm as your feet sweat and make them smell. Always wear socks. The second you notice they do get abit smelly, put something nice in it like a laundry softener towel or sprinkle abit of nice washing powder in at night and shake it out in the morning or put some washing powder in an old sock or tights, tie the end off and stick them in your boots, your own home made Ugg boot freshener

Never wear your Uggs with socks. The Uggs are made with twinside sheepskin, so they are suede on the outside with genuine, high-quality fleece on the inside. The fleece has natural oils in it that work with your feet. Socks impede the natural wicking process with the fleece. Just because they look like winter boots doesn't mean they can't be worn in the summer. They were designed for surfers, and keep your feet warm in the winter and cool in the summer. Try baking soda to get the smell out. Don't ever put them in the washing machine. Your boots shouldn't really smell like feet unless they get soaked from the outside. Even though they're naturally water-resistant, use the Ugg brand products to amp them up. If you're spending a fortune on these shoes, at least invest in the name brand cleaner. Don't use a generic.