I noticed in a restaurant the other day a beautful floor that was made from concrete that had been scored and then stained a deep brown. I've read on the internet about acid washing, stains, etc. but nowhere how to do this yourself - only companies that will do it for you. I was wanting to rip out the carpet and just use the slab underneath. Has anyone ever done this? I know I'll have to clean the concrete really well and then what? Thanks.