[GreenKeys] 37 KSR Black foam goo cleaning

[joeyd at modempool.com]

So finally got the Teletype and it is infested with decomposed foam 
black goo.
Took some photos https://photos.app.goo.gl/e9SWCc7gUiEwjG1V6
Plan on stripping it down next weekend and cleaning.
Any insights on cleaning that crud?
There is a video on Youtube working on the same TTY but he doesn't 
specify his "Solvent"
I tried a dab of acetone on one of the metal parts and the stuff didn't 
budge will have to experiment.
Also I'm missing a button on the front panel I believe its the Off Line 
Button.....Might just make that a 3D print job! ;-)

Thanks