Two years ago some workers went and did sawing on the table saw and left a mess of saw dust. I need help with trying to clean up the mess now. I had vacumed it and mopped the floor. Well I made a bigger mess of it. The saw dust as well as other dust is now stuck to the floor. I have treid sweeping it and is stuck to the floor. Tried some green stuff that you scatter on the floor never touched the drit and grim stuck to the floor. I have now bought a power washer 5 horse power hoping this will get the grim off of the floor. But where do I start with it ? I know I should clean the walls first. I bought deck cleaner so that it would not hurt the wood. It's a unfininished basement.