Kills on contact. 25 foot jet spray. Eliminates the nest. Non-staining. Contains no CFCs or other ozone depleting substances. Federal regulations prohibit CFC propellants in aerosols. (This product is non-staining to most home siding depending on age and cleanliness. Before using in areas where the spray may contact home siding, test in an inconspicuous area and recheck in a few hours).