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The first thing is to remove the speaker cover, most of the time they just pop off and pop back on.
Next is to remove the bottom screws on the frame, then remove the screws that hold the control panel on. and after all screws are remove you should slide the screen up and out of its' notches, then you can clean the three guns, and the inner part of the inner screen and the mirror, some models had a frame a piece that went all the way around that pop off and then there were screws all the way around. It isn't are that bad, you can do it. Good luck and have nice day.