If they are iron or iron bearing magnetics they will foul the pickle
pot Don't know about the ionic cleaner.
Heat will damage magnets in effect the hotter it gets the less it
will be magnetic What I know about the clasps they are rare earth
type or ceramic type, the high the gauss number the stronger the
connection 800gauss low strength 10,000gauss high strength. And most
of the clasps that I have seen are set up for split rings. If you
are worried about them coming off make up some connector rings of
three turns like the split key ring. They will not come off. Then
the last ring of the chain can be soldered, and run thru the cleaner
with out worry clean the clasp by hand and then mount. If you are
interested in high strength magnet of differing sizes in small
amounts here is a web site.They also have some every interesting
tools and things. The hardware catalog is a delight for the eyes
alone with all the old style repro's in it.
Again all the usual disclaimers and legal mumbo jumbo applies just a
satisfied long time customer
been there, done that and broke it!