"I can't say if Dettol is more effective than isopropyl, as I have no experience with Dettol. If so, that would speak more to Dettol being CRAZY effective than isopropyl being any kind of ineffective."
Dettol will quite happily dissolve, so far by my experimentation; acrylic hobby paint (VMC), artists acrylics (System 3), car primer & car paint (Halford), PVA glue, superglue, milliput and, eventually, appears to soften polystyrene bases.
I'm surprised iso works because I thought PMMA wasn't soluble in alcohols, although I'm entirely willing to be convinced I've misunderstood that; my understanding was that the active ingredient (for this purpose) in Dettol is the xylenol.