The only problem then is that it's much harder to get paint to adhere properly on already chromed parts. If you're going to go that route, you should at least sand/scuff up the existing chrome to give your new paint something to "bite" on.
Oven-cleaner and brake fluid is pretty harsh; I wouldn't use it to clean off regular paint apps. It'd be analogous to using heavy lacquer thinners; it'll definitely work, but you risk "melting" your plastic.
For regular factory paint apps, I've stuck to the 99% isopropyl alcohol.
Have you still got the Energon Sky Shadow? I am REALLY interested in him the most and maybe the Vector Prime and the red Powerglide possibly too, if you still have them or if someone else doesn't want them