Green algae is a green film on outdoor surfaces that usually forms during the wet season. The term "green algae remover" is often used to describe a variety of different organisms such as algae, moss and lichen that can accumulate on the outdoor surfaces around your home. Not only can these deposits affect the visual appearance of your patios, walkways, walls, roofs and facades, but they can also make surfaces slippery and unsafe and in some cases even cause structural damage. This is where green algae removers come in. Green algae removers are special cleaning agents designed to effectively remove these stubborn deposits and, in some cases, prevent them from re-establishing themselves. They work by penetrating the cellular structures of the organisms, killing them and then allowing them to be easily washed or brushed off.