I will hazard a guess all this removal depends on how clean the canopy is as well as whether or nor it is routinely waxed or otherwise "prepped".
An old crazed canopy that has no real maintenance done will make any paint removal harder, a canopy that has wax or similar will be easier.

YMMV.

Yes, start with a safe removal, then work your way up as needed.
No, I would NOT recommend anything that is/has a solvent other than maybe rubbing alcohol.
Lots of water is always good.......