After an hour of waiting, my car (white, 2013) still had dirt and streaks on several parts of the exterior. Not in a hard to see spot either, it was right on the back of the car. I saw it as soon as I walked up to it with the guy who hands you the keys back. He didn't notice, and neither did any of the other people working on it. Clearly nobody there even remotely cared to do a thorough job. To their credit, the place was very busy.
But the real disappointment was the interior - I paid for the highest tier including carpet and floor mats shampooing. They did that but left the entire dashboard and most of the console completely dusty and dirty. It looks like they wiped over parts of it once with a dirty towel and then called it a day. The inside door area was also barely wiped down, had spots and streaks everywhere. I think it was actually dirtier AFTER they "cleaned" it.
The waiting area inside (where the air conditioner lives and therefore the only realistic place to hang out in the summer) is very small and only seats a few people. There are more shaded waiting areas outside. The attached convenience store has a lot of options for drinks and snacks. Staff was very friendly but that doesn't suffice when you pay for a clean car and only get a somewhat cleaner car (after an HOUR of waiting).
This was not the best $60 I've spent on a car wash. I could have gotten the same result (minus the carpet/floor mats shampoo) for about $8 at an automated car wash. I will not go back to Cobblestone.