hackR, ammonia might strip off eyeglass AR (which is a different type of coating altogether), but on the tougher coatings it'll definitely be an exercise in futility as you can see. Lacquer thinner, acetone, you name it. Even with steel wool, it's going to put up a long hard fight! In fact, back when the 3717 first came out with its intense blue AR that you could hardly even see through, I found this to be almost impervious to ANYTHING. The polish I use is super expensive at about $65 per 4oz, but super effective too... Yet any time I get one of those crystals in (and thankfully its rare now), it still takes a good half hour to deal with from start to finish and that's with power tools.