How to Clean Limestone Without Damaging It

Limestone is a calcium-based stone, which means it reacts badly to acidic cleaning products. Anything containing vinegar, lemon, or a generic bathroom or patio cleaner with acid in it can etch the surface, leaving dull marks that no amount of scrubbing will remove.

The safest approach is a pH-neutral, stone-safe cleaner and a soft brush or low-pressure wash rather than a blast of high-pressure water, which can strip the surface and force dirt deeper into the stone's natural pores.

Limestone also benefits from a breathable sealant after cleaning. Sealing doesn't stop the stone breathing, but it does make day-to-day spills and dirt far easier to lift before they work their way in.

If your limestone already has dull patches, dark staining, or etching, a domestic cleaning routine usually can't fix it — that needs a proper deep clean and, in some cases, honing to restore the surface.