You should never clean natural stone surfaces (such as granite, marble, quartz, or travertine), waxed wood furniture, unsealed grout, cast iron cookware, or aluminum surfaces with white vinegar. The high acetic acid content in vinegar reacts chemically with natural stone and unsealed metals, etching the polished finish, dulling the surface, and causing permanent corrosion or pitting damage. Verification: Check the manufacturer cleaning guidelines of your specific countertop or fixture material before applying acidic solutions.
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