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.
The stuff I use (£1 a can from the local discount shop) is a mixture of heptane and methanol. It's definitely more aggressive than IPA.
@Brommers 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.