I went through this with my Trek OCLV.
Most paint strippers should be avoided, as they'll attack the resin. There are some water based strippers that are safe to use, but I only know the UK ones. Incidentally, they didn't touch the paint on my frame! They do work, I've used them before, just not on all kinds of paint.
The quickest way I found in the end was to use a brand new stanley blade/scalpel blade. hold it so that it's 90 degrees to the frame and drag it hard across the paint. it'll take the paintoff, and unless you're very heavy handed, won't touch the carbon & resin. Sanding WILL damage the resin & carbon, so be very careful.
If your paint is good, I'd rough it up and re-paint, mine was very rough so I removed it all, and It did take a very lon time...