<< what is the best way to strip the pain off of metal radiator covers? >>
Sand blasting is the fastest most effective way. If you have an air compressor
there are low cost units that will do the job nicely. Commercial units are just
a bit too hairy unless the technician can calm the velocity down to just get
the paint without distorting the metal grill work.
There is a wide choice of media, like walnut shells, plastic bits, glass beads
and such that can be used in the civiian models. I have used glass beads mostly
in my rig. HTH