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J13 Radiator

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Rust is from the cast iron block, the rad is copper and brass. Try laying it face down with rad cap on and fiil with CLR and leave over night.


It dissolves lime scale and rust won't hurt copper and brass.


CLR  Calcium, Lime & Rust Remover, 828-mL Front_Flat


Used on my rad, sat for 3 days before I could get back to it. That was several years ago.

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