Do you know how the grouts between the tiles get filled with dirt and become darker over the time? I don't like it when I see them that way and I know what a major pain it is to scrub them. I did not have the time nor the desire to do it so I called this company. I have to confess, it's my first time using a cleaning team and trusting it with the hygiene and safety of our home. However, they were of big help and I understood the advantage of hiring a professional - I saved time and energy and got a shining tile set in the bathroom.