I would disassemble the bow first of all
if it is spray paint you could use laquer thinner but be careful and use spairingly this way you will not do to much dammage to the original finish, once you get it back down to the wood
once you get the paint thinned down you may want to use mineral spirits because it is not as caustic as the laquer thinner
then you will probably need to sand it with some 1200 grit wet sanding paper then refinish with Polyurethane.