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Alan,
The safety faceplate is a separate sheet of glass bonded to the CRT face like an automobile windshield with a sandwich of plastic resin. This resin develops mold or turns yellow on many of these tubes. You have to physically carve/dissolve the film out from under the glass by working around in from the edge. It is very tedious, painstaking and dangerous work due to risk of implosion. There are almost 3 tons of air pressure on the faceplate. Once removed and surfaces cleaned spotless I re-attach the safey glass using a bead of RTV silicone around the outside edge and an airgap between the glass surfaces the thickness of a popsicle stick.
Rob
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