How do I protect marble countertops?

Marble is porous and sensitive to acids, so it needs regular sealing, often every six to twelve months, and careful cleaning. Use a pH‑neutral stone cleaner; avoid vinegar, lemon juice or other acidic products that can etch the surface. Wipe up spills immediately, especially wine, citrus or oil. Use cutting boards, coasters and trivets to prevent scratching and staining.