Stain or marks on Superocean case steel??

[burnthesehills]

I noticed a couple marks on the case (crown side) of my SO42. It is not even 2 years old and has only seen about a year of daily wrist wear. I tried cleaning (diluted Dawn and water solution) and wiping down / rubbing with a cloth. No luck removing. Any ideas what this might be? There are actually a few of these spots on the side of the case and pretty obvious when looking with the naked eye from the side.





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