Cleaning Polyester Capacitors

I've been given a bunch of Caps that the giver was using for experimenting crossovers.
Unfortunately they appear to have been liberally coated with some sort of bitumen type compound and a strange sticky grey blu-tak like goo. (possibly to damp vibration ?)
Alcohol based solvents dissolve the goo but so far only Turpentine will remove the "bitumen"

Is it ok to soak the caps in Turps followed by Meths to clean ? or have you any other suggestions ?
 
Electrolytic capacitors: the synthetic rubber seals are formulated to be unaffected by the electrolyte and organic solvents.

Film capacitors: the protective layer of lacquer or plastic will be unaffected by a household organic solvent like turpentine or meths.

To check the veracity of the above information, I suggest you perform a 24 hour soak test.
 
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