[asymptonic]

When I've encountered this in PCs it comes off with rubbing alcohol. Maybe a nylon bristle brush too?

 

[reiderM]

I used a small plastic scraper. A credit card could work in a pinch. Then I hit it with some brake cleaner. Be careful not to get the brake cleaner on any of the plastics as it will eat right through it, it's a strong solvent.

 

[reiderM]

Also there are two pastes: glue, which I am not sure the conductivity of, and some sort of dielectric grease on the threads for corrosion resistance and to keep the bolts from backing out (to an extent).

I tested the resistance of hardened glue with my multimeter and got a reading of 0L, indicating it's non-conductive. If anyone has found otherwise, please chime in.