That’s the whole question: what is the active ingredient(s) in DIP-IT® Coffee Maker Cleaner and Stain Remover?
The MSDS lists 20-22% citric acid and 5-8% sulfamic acid. I’d imagine the rest is just water.
On a related, CS-esque note, does anyone remember the TV ads for Dip-It back in the 60s that featured a coven of cackling witches? (IIRC, they were doing the “bubble, bubble, toil and trouble” routine.) That was a little bit frightening to me as a small child.