Brush your suede boots with a stiff-bristle brush after wearing. This will help raise the nap and loosen any dirt that may be clinging to the leather.
Rub any stained areas lightly with a gum eraser. Take care to rub in only one direction; if you use a back-and-forth motion, you may make matters worse.
Treat the suede with a misting of water- and stain-prevention spray. All products are different, so follow the directions on the product label. This type of spray will help ward off stains. Let your boots dry completely before wearing them again.