spray in garage, porches, decks, barns and even in all indoor areas; Non-staining...adheres to any surface! Cobwebs are eliminated and stops reformation for up to 6 months indoors and up to 3 months outdoors! Eliminates dust, pollen and insect debris. Another phobia control product exclusively from Dr. T's Nature Products. Cobweb Eliminator is a 100% natural, biodegradable, non-toxic spray.