Be vigilant about any mud and dirt tracked into the house; have a strict Take Your Shoes Off at the Front Door policy. Clean up any dirty shoeprints as fast as possible. Prevention goes a long way with travertine. Natural stone floors, though beautiful, have qualities that make them hard to finish, polish and clean, particularly travertine, with its air pockets, roughness, and pores. Travertine flooring should always be sealed with a penetrating sealer. Finish coat sealers that work on other types of stone flooring are not suitable for this type of stone. Travertine varies by grade, density, and porosity; it is available honed or in a natural state of finish. Cleaning, polishing and sealing methods need to be carefully matched to the stone.