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Author Topic: What caused this?  (Read 976 times)

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  • Posts: 17
  • Location: Rockaway Beach, NY
Re: What caused this?
« on: March 26, 2023, 10:50:04 am »
It's not mineral deposits.  Steam etches glass. I work on steam heating systems and this is why we change boiler sight glasses.  I suppose if you like you can try polishing it with toothpaste and possibly clarifying it.
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