aFe POWER Air Filter Restore Kit is a one box solution to service your aFe POWER cotton gauze air filter. Proprietary ingredients used in the oil are void of contaminants that could damage sensitive vehicle electronics; the special formulation for the cleaner breaks down oil, dirt and dust while not harming the cotton gauze. aFe POWER cotton gauze filters are washable and reuseable, proper maintenance is key to a long service life. After cleaning, make sure to re-oil your filter; using a cotton gauze filter without oil will severly impact its' ability to protect your engine.