Go to the 4:30 - 5:++ minute mark: "We pick it up, move it and pressure wash the floor under it every three months or so...." And that's just car wash dirt, not oil, coolant, or other shop liquids or grease. I've used this type of floor covering for literally a coupe of decades and it's not my first choice for a semi-permanent WORKSHOP floor covering. Just my twocents again.