screamingdan - A belated Welcome to Autopia. You've alluded to your age and some physical limitations (I saw your other post), so I suggest you do the LEAST work necessary to get the job done. I'm glad to hear you're still working at keeping your PT nice. FWIW, my father was still detailing his car (with a little help) well into his 80's.
Dawn does NOT do much to remove sealants, but I'd wash with it this time anyhow. Won't hurt anything and it's cheap and effective.
The solvents like JimS is recommending WON'T remove any paint/clearcoat. They just dissolve whatever's ON the paint, like waxes or Zaino. But it's still extra work. An abrasive, like your polish, will also remove whatever's on the paint, and a tiny bit of your clearcoat too (which is OK). Since your Z is 6 months old, I'm guessing the paint could do with a little polishing. The Deep Crystal system you have should work fine.
You might want to consider buying some Collinite wax. It's quite reasonably priced and it lasts a VERY LONG time. You could put it over your Meg's stuff. Just something to think about for next time. Long lasting products equal less work in the long run.