There are holes for the floppy drive, volume knob, and speaker grills in the front case, no way to make those water tight and the metal frame will react with the peroxide in seconds. If you are not going to do it correctly don't do it at all.

I removed the CRT from the front panel without removing any wires from the power section. All you do is remove the metal frame to get to the 4 screws holding the CRT to the front plastics and them slide the power section and CRT board off the plastics at the same time moving the crt to something soft so you don't scratch the face. Make sure you don't screw up the volume knob putting it all back together.