Tile, Grouting, and Hard Floor Care At first glance, hard flooring appears to be easy to clean, maintain, and restore. However, these materials tend to have soil accumulate over time and regular mopping will never reach the hidden dirt that is beneath the grout lines. Grout is Hard floor material (Porous) and it collects dirt and spills which changes the color of the surface over time. Eventually you will need professional cleaning with advanced equipment to remove and restore the hard floors. At Astrum Public Health, we have the most advanced equipment and Eco-friendly cleaners to remove the hidden dirt and can restore the hard floor to its original state.