WD and a wire brush will clean up that white Aluminum oxidation quite well.
If it's not cleaned, it will just continue "Crawl" into the other parts.
Any type of grease should be fine temporarily, just not any type of Anti-Seize because of it's Nickel content.
Remember though, all oily parts should be cleaned w/ Lacquer thinner, or Acetone, or else the Coax Seal may not stick.
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