I used to call "Image Perfect" glass "Image Imperfect".
We used it in a shop that I worked for in the late 80's, early 90's.
It was almost impossible to clean.
I remember that we did a large framing job for a bank in Phoenix back then and they were so not happy with the cleaning situation that we took the frames back and replaced the glass with another product.
I had some Image Perfect glass once. It was a slightly finer version of the so-called "non-reflective"
stuff that was all the rage before AR coated stuff became available. In short, it was a "faster horse".
I echo Neil's comment about the impossibility of cleaning that stuff. It was the most frustrating experience you can imagine. I ended up throwing out the rest of a case of it, and it made a very satisfying crash in the dumpster.
Agreed with all of these. The frame shop where I worked in the 90's had it. A nightmare to clean. Weird other stuff, too. The owners hung a framed piece where sunlight hit it (yes, I know this shouldn't happen), and the sun made drops of water condense inside. When they ran down the inside, they left image trails, and no amount of cleaning could get the stuff off. We had to throw out the glass. As soon as I began managing the framing, I got rid of it. Do you have a framed piece with some?