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The Patio Magic! Green Mould and Algae Killer Liquid Concentrate Bottle, 5l is a good bargain since it is affordable and does the work. This patio cleaner works faster than the Wet & Forget – Moss Mould Lichen & Algae Remover giving you results in a few days. This is strictly an outdoor cleaner since indoor use is dangerous to your health. If you were looking for a strictly outdoor mould and algae cleaner, you have found one. Remember to read the instructions so as not to miss out on any important information.