How to get rid of Bondini residual glue ?

Ouch, you've got a potential tough one. Bondini is a superglue/cyanoacrylate type adhesive, so you'll be using one of three solvents: acetone, nitromethane, or methylene chloride. The last two have problems, as in explosive and toxic in the extreme. I'd try acetone first, but there is a probability that the acetone might craze the plastic. I'd make some very small applications to as inconspicuous a spot a possible to test for damage potential first. It might be best to contact BAT and just buy a new window.

I checked and tested acetone on every clear plastic sample we had around our studio. Every one was hazed/crazed/damaged to some degree. Plexiglass was damaged the least. You're probably best trying to buy a replacement window.

If the face plate can be removed from the player, you could try this. Put something like artist's paper tape around the face plate fascia where it butts up against the plastic window to protect it from what follows. Freeze the face plate in as cold a freezer as you can find. (Low temperature weakens cyanoacrylate bonds.) Then try prying loose the window. If the face plate & windows are dissimilar materials, you've got a better shot at this working. I suppose it's possible to take this even further with dry ice in a portable freezer chest. That would really get Bondini below it's designated range of temperatures. It's unfortunate that Bondini is the latest generation of superglues that make tougher bonds than ever. If the face plate is anodized aluminum, you could also try injecting acetone into the crack between the fascia and plastic window with a hypodermic syringe (testing first on an inside surface.)