[Chas]

I, would leave the can in place, disconnected. Trace the wires into the chassis and see if there is an available terminal and for the (+) and the (-) that can comfortable span the leads of a replacement electrolytic with some sleeving over the leads. Most often there is a location. The location should NOT be next to the volume control or in the RF area of the chassis. If there is no location find an area where there is an existing hole and install a terminal strip to support the cap and bring the exist leads to it. Or, drill a hole in the side of the chassis for the same. FWIR this cap is above chassis ground so either lead wire must not touch the chassis.

The crust is borax combined with extracted sulfur from the terminal gasket.

GL

Chas