07-24-2013, 05:22 PM
I cleaned one last fall as an add on to the residence. I can tell you that vacuuming the sand out is a challenge all by itself. That being said, I used a portable extractor with a LM cleaning solution. The stains lifted pretty easy, but there are alot of tight angles and spaces to work through. An hour for a hundred bucks. I would do it again, but not as a business I would go after in and of itself.
Ed Elliott