Easiest way to remove butyl tape?

I need to remove butyl tape from a lot of bolts. So what is easiest way to remove butyl tape?

Turns out mineral spirits dissolves butyl tape real easy. I added mineral spirits to a small jar with three bolts in it. Shook it for 30 seconds. As by magic all the butyl tape dissolved.

Before

Mineral spirits

After shaking the jar for 30 seconds 

After