Polished marble, travertine, onyx and limestone are all calcite-based stones and are affected by pH active liquids. So when acidic liquids hit the polished marble, travertine, etc. surface, it can etch. That is, it leaves a mark of corrosion that looks like a water-stain or ring.
The damaged surface must be re-polished. Marble is polished by abrasion and friction it can not simply “buffed up.”