The Bring It On Cleaner Drill Scrub Pads Plus and Corner Scrub Brush are drill attachments designed to clean stained or discolored tile and grout. The brushes are made from polypropylene nylon bristles and can be used on any surface that could be cleaned with a toothbrush or scouring pad. Bring It On Cleaner 800-867-2643 or bringitoncleaner.com