Which is better, DEOXIT, RIDOX, SUPER CONTACT CLEANER, WD40 or..
....are they just all the same, as far as results?

M.G. Chemicals' "Super Contact Cleaner" is $10 versus $17 for Caig's
Deoxit in our town. One electronics repair shop said he preferred a
non-Deoxit becuase he alleged that DeOxit caused certain unspecified
problems. If he is telling the truth, any idea what he is referring
to?