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The Wet & Forget – Moss Mould Lichen & Algae Remover (5Litre) is a good choice if you are in no hurry to clean your patio. It is a slow acting detergent especially if the stains are too deep. You will have to wait a few months to get the right results. The good thing is that it has little work attached to it. Just spray it and leave it to do its work. You can apply a second coating if you notice that the algae are re-growing. It is affordable and effective, you just have to wait a little longer.
