 I got about 20 linear feet, and it goes up about 10 feet. So I got a decent-sized area that I have to clean. You know what I would do, too, is I think I would test. Before I really got into the whole project, I would get like a quart of it, and I would test like a four-foot strip down at the bottom and just see how it removes it. You'll learn a lot by using it.