Much depends on what you wish to do after the wraps and guides are off.
Do you want to wrap new guides over the same locations? If so, gently sand/file/abrade the old varnish residue off the rod. You will put new wraps and finish over the sanding marks, so you do not have to be perfect about getting everything off. Just clean up the bumps enough that you can wrap over them. Make sure you don't cut into the underlying fiberglass and you will be good.
Do you want to put the wraps in different locations? Sorry, the old wrap locations will still be obvious. You could over paint the blank or put decorative wraps over the old locations. Nah. It is easiest to simply wrap on the guides, finish them, and then go fish the guides off the rod. Once you have done a couple of rods
then worry about making them pretty. In the meantime, enjoy fishing it and learning where you like to put the guides. Finish the wraps with varnish (it is easier to remove than epoxy) so you can redo the guides again later this year.
Solvents strong enough to remove the old, cured varnish are also strong enough to remove any other finish on the rod. For a listing of solvents that you can (and shouldn't) use,
see this old post. If you do use acetone, use it carefully with a Q-tip. You can't undo anything you mess up with acetone...
Tom