Mosgo Dual Active Algae Remover 5LHygeia Mosgo Algae Remover Dual Active Restore the appearance of exterior walls and hard surfaces with Hygeia Mosgo Algae Remover Dual Active. This powerful dual action treatment is specially formulated to remove and prevent red and green algae discolouration, helping keep your home and outdoor surfaces clean and well maintained. Ideal for exterior cleaning and preparation before painting, it works deep into surfaces to kill algae, mould, and lichen