seized screws rust or whatever was: leaky batteries!

While everybody else is talking about cleaning up the leakers, Is this chemical is good use to dissolve rust on steel screw is rust seized in the potmetal or aluminum distributor? I have similar situation a steel screw rusted tight in distributor's body, other screw I successfully removed. This two screws does have a job to hold on black plastic splash shield because the distributor is on front side of engine, shield deflects water spray away. Shield is missing and installing with it found from junkyard. The philips head isn't chewed up yet. This distributor in question is in the 1987 2.2L plymouth caravan. Oh does have primitive computer mostly to control three vacuum soleoids and advance/retard spark timing instead of mechanical means. Distributor has hall effect sensor btw. So it's almost on topic. :-) Finding another distributor is not easy because I looked enough to know that vehicles at junkyard isn't old enough to have this kind ditto to carb (holley 5220). :-( ) Those 'vans I looked had TBI 4 cyl 2.5L or 3.0L V6 mitsubishi engines. Oh to quell quips, the 84 to very early 87 distributors and later 2.2/2.5 distributors aren't same. Hall effect vanes is on rotor iteslf with vanes down on those like mine. Later ones has vanes mounted to the shaft pointing up with rotor seperate from it. Have to deal with what I have now. Cheers, Wizard