Even after a long afternoon spent mowing the lawn, your work is far from over. Most likely, mowing has left behind grass clippings, which can cause stubborn stains on concrete and stone once they begin to decay. To clear them quickly, pick up a Black and Decker 20V Cordless Sweeper and speed through cleanup on stone paths, patios, and driveways. Powered by a 20V lithion-ion battery, you won't be held back by a cord—or short battery life. Available at Amazon; $77.94.