Soaking with WD40 or Plusgas will probably soften it if those solvents haven't worked.
There are cans of spray brake cleaner you can get for the car, but I think it's not much more than low-ish grade isopropanol.
I think it's not much more than low-ish grade isopropanol.
Seems to be mostly acetone and/or heptane now that they have effectively banned chlorinated solvents from retail products.
I suspect that ultrasonic is a better plan than going down a solvents rabbit hole.
@gbj_tester started
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Soaking with WD40 or Plusgas will probably soften it if those solvents haven't worked.
There are cans of spray brake cleaner you can get for the car, but I think it's not much more than low-ish grade isopropanol.