Rust

Rust is an iron oxide, usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.

Further reading from Wikipedia

Yellow Brick Strong Acid Cleaner - Neolith YBSAC

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Heavily Soiled Sandstone Cleaner - Neolith 625SS

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Strong Sandstone Cleaner - Neolith 625 Special

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Brick and Terracotta Cleaner - Neolith 600

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Aluminium and Stainless Steel Cleaner - Neolith 438

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