For rubber rollers, what you want to use is the classic mix of solvent (toluene) and wintergreen oil, sold as "Rubber Renue" these days.

The solvent helps the mix to penetrate then it evaporates, leaving the oil embedded in the rubber. Works great.

This concoction might work on Altec goop too...but I'll let somebody else risk their 756Bs to find out!!

I think the acetone dissolves the hard outer layer and softens the rest of the goop. Eventually, it will probably dry out again.

What's the alternative?