[GreenKeys] Sticker removal from 33 cover

[Charles]

Thanks for the suggestions, everyone.
Water and 91% isopropyl alcohol (and scraping carefully with the edge of a 
knife) took care of the label itself, but nothing short of dynamite will 
completely shift that nearly-50-year-old adhesive.
I tried Goo Gone and WD-40 with little effect. The only thing that would 
really dissolve it was 3M Adhesive & Trim Remover, a very aggressive mix of 
solvents which also attacks the plastic.
If you look in the right light, you can actually still read some of the 
numbers from old TWX label.

This cover is not restoration-quality by any means, including a visible 
glued crack, so I'm not too worried about it. I do have a much better cover 
but it's missing the clear window.
Whatever they used for that adhesive, I'm impressed!
http://s1181.photobucket.com/user/DrCharlesMorris/media/PDP-8/P10-09-15_19.44_zpskr9meuec.jpg.html