Bricks, Masonry, Asphalt and Concrete - Tough stain in concrete patio

Excuse me if this is not the right forum for this question...
We had a spill of a carton of buffalo wings and sauce on our patio about two weeks ago. The patio is concrete, with a pebble finish. It was hosed off, but the area hit with the sauce stained. It basically looks like it's wet when it clearly isn't. The pebbles are ok, it's the exposed concrete that isn't coming clean. I even got out the power washer, but it didn't take care of it.

Any ideas?

Thanks,
Brian

Never thought about it, but I guess BBQ sauce is like an acid stain (vinegar?).
How's the color? You may have stumbled onto something here :D

You might try a solvent like Xylene (available at the big box stores and Sherwin-Williams), but the stain may be there for a very long time.