Is there a way to restore this concrete? It’s only six months old so we can’t power wash it. In the pictures you can see a clean area where I was told someone poured vinegar. I tried the same thing and nothing happened so I don’t know what they used. I did a test spot with some oxalic but no real results. Any ideas? I’m not sure what’s going on with this driveway. It looks like the top layer needs to be removed but I’m far from a concrete expert.