The newly designed Berta Advanced electric sponge machine from Raimondi Tools USA can be used to clean grout from tile and stone surfaces. Designed for medium-to-large tiled areas, the Berta Advanced machine can clean from 800 to 1,500 square feet an hour, the company says. Additionally, the Berta Advances leaves all joints evenly full and cleans the surface with one pass, Raimondi says. Circle 320 on the Reader Inquiry Card.