I don't know how much an outfit costs but if you're going to be doing dishwashers as a regular gig, you might want to check out someone who uses very high pressure water "cutter" (for lack of a better word). I ate lunch with a guy at a Scout learning day one time that used one of this outfits for his job. Sounds like they can do a lot of amazing things. Might just cut that nasty insulation right on off ??