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WD-40 Specialist Rust Remover Soak Safely removes tough rust from metal parts and tools ;All ingredients are biodegradable ;Targets the rust, safe for surrounding areas ;Non-toxic and acid-free The capillary action penetrates into tight crevices, threads and seams to break the bonds that hold stuck parts together. Helps prevent rust and corrosion from re-forming and leaves behind a lubricating layer. Ideal for use on nuts, bolts, threads, locks, chains and rusted things that are stuck and won't move. Safe to use on plastics, rubber, and metal.