Aluminum head shine

A Polish is going to work by chemical or abrasives and some are a combination of both.
Be careful as some have to much abrasives and put scratches in that require use of Compound or Sanding.
You are better off sanding like I mentioned and then polish.
Major corrosion will require sanding, black emery, gray emery, white rouge. And a clean up final with Wenol or Speedy
Good emery has great abrasive suspended in a grease that really last and works for you. Not yiu working it.
Last batch was from Infinish