The top 2 reasons are because of appearance & safety. If you have concrete floors coated with grease at your restaurant and you walk to the back, slip & fall, chances are that your staff probably only mops the floors. Mopping only spreads the grease rather than removing it. For situations like this, our team uses steamers & scrubbers. Since Pressure Washers use a lot of water and pressure, our steamers use steam and some pressure. There are different applications for different surfaces.