paint stripper wont touch the chrome
and if they were sprayed with a rattle can, the paint will fall off pretty easily
how much the chrome needs polishing depends on how well you prepped it for the paint:
if you went nuts with 40 grit paper on it before painting, its gonna need some polishing
however if you just degreased the chrome then painted, then just polish it by hand
there are many products on the market, but i use autosol then brasso. just because thats what i have in the cupboard