Rick-

I am leery about using electrolysis to clean something like a saw plate,
potentially removing things I'd prefer to keep.  Here is some information
on a technique that preserves much of what is on rusted saw plates to the
extent possible-

https://www.forums.woodnet.net/showthread.php?tid=6366663&highlight=autosol

Unfortunately the accompanying pictures are lost, but the results were
impressive.  Use a gentle hand.  Once it is scraped off it is very hard to
put it back on.

This site also has templates for a wide variety of saw handles that may be
helpful when you decide to replace any-

http://www.tgiag.com/saw-handle-scans.html

Phil