A beach cleaner is a vehicle that drags a raking or sifting device over beach sand to remove rubbish and other foreign matter. Smaller beach cleaners are either manually hand-drawn or pulled by quad-bike or tractor. Seaside cities use beach cleaning machines to combat the problems of litter left by beach patrons and other pollution washed up on their shores. A chief task in beach cleaning strategies is finding the best way to handle waste matter on the beaches, taking into consideration beach erosion and changing terrain. Beach cleaning machines work by collecting sand by way of a scoop or drag mechanism and then raking or sifting anything large enough to be considered foreign matter, including sticks, stones, rubbish, syringes and other items

http://en.wikipedia.org/wiki/Beach_cleaner