zmcgovern45- Except that the IPA simply didn't strip some oils for me, no question about it...just didn't work well. My guess what that while IPA might be the "stock answer" it might not always be the most effective solution in every case and I suppose it'd be unfair to expect every manufacturer to know what works (best)/doesn't with regard to products from other manfacturers.
I'm not hating on IPA, I keep a spray bottle of it on the shelf, works fine when I use my non-M205 polishes- E.g., HD Polish and polishes from Optimum strip away just fine with it prior to coating.