I'm finally putting the finishing touches on refurbishing this old coin door, but the red coin return buttons are really squeaky (even after thorough cleaning). It's plastic on plastic (the black housings are plastic, even though most of the door is metal).
I did a bunch of searches and read Ken Layton's suggestions on lubes, but I'm not sure he ever directly referred to this kind of plastic on plastic situation. I bought the Radio Shack lube gel ("grease") from the Midway coin door thread and Super Lube Dri-Film Lubricant (from the WD-40 thread). I've tried the Dri-Film where the clear red button meets the black plastic. It lessened the squeak a little, but it's still there.
Should I clean the Dri-Film off and try the grease? Any other lube suggestions?
I have these rigged to be my credit buttons, so I'll be using them a lot.