Silclear , Caig ProGold, or Kontak?

Kontak has always worked well for me for cleaning. Caig is also very good, but consider using their cleaning product, Caig DeOxit rather than the ProGold which is a lubricant/preservative for use after cleaning (although many people use ProGold for both duties).

OTOH, 92% isopropyl alchohol does a good job for most cleaning if you don't have visible oxidation, and it's US$2.00 a pint. (Just make sure it's pure alcohol with no additives.)

SST is the best contact enhancer available - absolutely agree. But the question was about CLEANING contacts, even though the subject line listed products not made for this purpose. One needs to clean the surfaces before applying Walker Audio's SST, and for cleaning, use either Caig DeOxit or Kontak.