Tile Grout Cleaner Heavy Duty (1 Gallon, 4 Pack) - Deep Cleans Kitchen & Bathroom Floors, Tiles - Perfect for Removing Stubborn Stains & Restoring Shine - Ideal for Home Cleaning & Commercial Use

I sprayed it on very dirty tiles/grout using a pump/wand style pneumatic sprayer. Let sit for about 5-7 minutes and scrubbed with an orbital machine from that company that starts with “O” and ends with “reck” and the blue brush.Dirt and grime came right up in just a few passes of the machine; working carefully into the 1/4” grout lines.Rinsed with terrycloth towels. WOW THE TOWELS WERE SO FILTHY FROM ALL THR LOOSENED DIRT/GRIME!!!Afterward the whole tiles felt smooth and clean, grout brighter that is has been in years.Low odor, but I did notice my hands very a little strange/rough after cleaning the towels up. Next time I’m wearing gloves.