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LIFTS RUST STAINS FROM PATIOS: Go Ferrous is a rust stain remover made for patios, paths and garden stonework. It clears the orange marks left by lawn fertiliser, BBQs, garden furniture and metal plant pots, bringing back the natural colour of your stone MADE FOR STONE AND PAVING: Use it as a rust remover for patio slabs, paths and steps in Indian sandstone, Yorkstone, limestone, granite, block paving and most other paving. Unlike aggressive acids, it won't etch or damage the surface. Not suitable for Kandla Grey sandstone REMOVES FERTILISER STAINING: Lawn feed and lawn sand contain iron sulphate, which leaves rust coloured spots wherever granules land on your paving. This rust remover for stone dissolves the marks that a jet wash alone can't shift, and it clears green algae too GARDEN FRIENDLY AND ACID-FREE: The clear, biodegradable formula is made from recycled green leaf vegetables and has no smell. Once the treatment is finished, the runoff can be rinsed into flower beds and over the lawn without harming your plants EASY TO USE: Shake well, pour or spray it onto the stain and spread it with a brush so the whole slab is covered. Leave it for 2 to 3 hours, then rinse with hot water or a light pressure wash. One 4 litre bottle treats up to 20m². Deep stains may need more than one application for the best results