Looking for suggestions on cleaning unfilled travertine flooring. I have had in the past great success cleaning dirty travertine flooring with Miracle Sealants  Liquid Poultice A&B. But they did not have such large voids. Plus a problem with Liquid Poultice is that it needs to be left on the floor about 45 min. A really slow process. I truck mount is out of the question, the condo is on the 61st floor of a high rise! Any suggest appreciated !