Vinegar is acidic and useful against some mineral deposits, but it can damage natural stone, certain finishes, grout, and components that are not acid-resistant. Being a common household product does not make it safe for every surface.
Keep it off acid-sensitive natural stone
Marble, travertine, limestone, and similar stones react with acids and can become dull or etched. Use a stone-safe cleaner with an appropriate pH and follow the sealer or manufacturer guidance.
Do not assume it is safe on wood finishes
Acid and excess moisture can dull waxes, varnishes, or delicate finishes. On floors and furniture, the finish manufacturer’s care guidance matters more than a generic vinegar-and-water recipe.
Never mix it with bleach or other chemicals
Vinegar and bleach can release dangerous chlorine gas. Do not combine cleaning products by intuition; if you switch products, rinse the surface thoroughly and ventilate first.
Follow appliance guidance
Coffee makers, washers, dishwashers, and appliances with rubber or metal parts use different internal materials. If the manual does not recommend vinegar, do not pour it inside assuming it is a universal descaler.
Sources
- American Cleaning Institute — Cleaning Tips — Household cleaning practices, product dosing, and compatibility with surfaces and materials.