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Most gold jewelry can be cleaned in hot soapy water and gently brushed with an old toothbrush. 18 carat gold and over are not usually spotted and damaged household chemicals. Lower carat gold can easily be damaged by chlorine-based bleach and cleaning products, which can cause stress corrosion. Platinum can be cleaned the same way as high-karat gold. Patina that develops over time can be removed by a professional jeweler who will repolish back to its original highly polished appearance.