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Maybe you've been walking in a winter wonderland, but that doesn't mean your UGGs need to show it. Salt and dirty snow can leave tough stains on your boots, but if you clean and protect them with the right product, you'll get years more wear out of them. The company itself recommends the UGG-brand products for best results, and be aware that your boots won't be covered under warranty if different products are used. However, there are less expensive options that will keep your boots in top-notch shape.
What is Nubuck?
Nubuck is the grainy outer side of leather that has short, velvety fibers. It's a similar material to UGGs, but UGGs have a tanned sheep skin exterior. If you've got a Nubuck protecting spray, you can use this on UGGs because both textures will react the same way. Be warned: it will temporarily darken your boots because they're more porous than Nubuck -- it will dry back to regular color, though, so don't worry.
Protectant vs. Cleaner
Protectants will form an invisible film to shield your boots from water and oil, while cleaners will remove the damage that already has been done. UGG sells cleansers in both spray of shampoo formulas, so your choice should depend on how scuffed up your boots are. If you've only got a few spots, the spray will take care of it; if your UGGs look like they've seen better days, they need a proper shampooing.
Never use warm water to clean your UGGs. It will shrink the fabric and ruin the soft texture of the sheepskin. Instead, use cold water on a microfiber cloth -- and dab, don't soak. If stains are stubborn, such as those left by salt on icy roads, use a special suede brush (or a soft toothbrush, if you're on a budget) to loosen the stain. Shoe experts also recommend plain chalk dust for loosening tough stains. Rub some on to loosen oil and dirt particles.
Make sure that your boots are stain-free and dry when you're waterproofing them. To really protect your boots, double up: spray on an even layer, then let it dry for at least 20 minutes before applying a second coat. Even if you're anxious, don't use a hair dryer or a fireplace to dry your boots faster -- these can burn the sheepskin surface. Instead, let them dry overnight. Finish with a freshening spray inside the boots to protect against odor and bacteria.