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Any idea what the metallic content of the coating actually is ?
Al (Aluminium) is removed by NaOH ( Caustic Soda or Drain Cleaner). A very very diluted solution might be an option although I think you would be advised to dissassemble the EP so it didn't migrate back into the body.
Sulphuric Acid (H2SO4) could be available from an old car battery, a couple of drops would be more than enough. Copper, Zinc and other metals are susceptible to that one. Again dilute well and dissassemble.
HCl you have already covered.
Wash well and rinse a few times after if you go down any of these paths. None of them will attack normal glass elements but I can't vouch for more exotic lens.
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