Do the complete strip down. In the end I removed the following:
Windsheild
Rear Hatch
Quarter Windows
Sunroof
All lights (exterior)
Door handles
Mirrors
front clip (less the fenders)
Hood
Door latches and catches
Stickers
Stone guards
All exterior rubber and gaskets
Alarm lock
Rear Spolier
Wipers
Emissions stickers in the door jam (you can get new ones at the dealer)
Door glass
Door skins
Bumperetts
Also to answer your question yes you do need to use flex additive on the rear spoiler and font valance. I had them mix a hybrid of Glasurit and PPG flex additive to do all of my flex parts. If you don't the paint will falke off in a few years. Also if you can swing it use the factory Glasurit, its not much more and it really brings out that factory look.
I am attaching some pics, the first is from a concurs that I took first in, the second was last summer after its first wax.
