Hiking boots can last longer if they are kept clean. While laces may be washed in the washer, the boot's rest needs to be cleaned. Water, dirt, mud and mold can all cause damage to the leather and fabric of your boot, which will reduce their life expectancy. Wash the boots to remove dirt and grit from their outsoles. You can use a boot cleaner that is approved for hiking shoes and brush it to remove any dirt. Rinse clean. To speed up drying, take off the insoles. You may also want to condition leather boots with full-grain uppers if they become cracked.