#3: Coffee Grounds.
Who doesn't love the smell of coffee? According to Green, it's another weird odor remover that helps cut the smell of winter mustiness. You can use fresh or used grounds, but if going with used, let them dry out a bit first. Place them in a bowl as is wherever you need an odor removed, or wrap them up in a coffee filter or old stocking and hang them in a closet or from a shelf. If you're not a coffee drinker, you can still benefit. Some Starbucks (and many small locally owned cafes) give their used coffee grounds away for free.