Chrome, stainless steel, aluminium, and exhaust pipes react differently to oxidation and dirt than body paint. A dedicated metal polish contains milder abrasives tailored to the soft but sensitive surface structure of metal. Regular car polish is often too aggressive and can leave fine scratches that are far more visible on shiny metal than on paint.

Results vary significantly by metal type: polished aluminium retains gloss less durably than chrome-plated steel, and stainless steel is particularly prone to heat discolouration. Choose the product based on the metal type and the degree of oxidation.