Use Gutter Zap to make grimy streaked gutters look brand new again. This biodegradable gutter cleaner is the quick and easy way to get rid of those ugly black streaks caused by the electrostatic bonding of dirt and acid rain runoff from roofs. Simply wet down the gutter with water, apply Gutter Zap Cleaning Spray, use a Gutter Cleaning Applicator (sold separately) to wipe the surface, then spray off the residue with your garden hose. Your gutters will look bright and clean in just minutes! Gutter Zap Cleaning Spray comes in a ready-to-use 1-quart bottle.