the bottle of starsan got knocked off a table and then sat on the garage floor for a few days before I noticed it. Then life got in the way and I let the stain sit there for a couple weeks before I got around to cleaning it up. Then I cleaned it off with baking soda and since starsan is acid based it ate a nice hole in the concrete as if it were battery acid. Probably a good idea to clean it up a little sooner.
