insulators and cleaning

Hi,
I received a bunch of clear glass insulators from my sister-in-law that she didn't want. They had been dug out of the ground - were dirty and some with brown coating from the dirt. I hand cleaned them with Dutch Cleanser or Comet Cleanser and steel wool soap pads. They come out shinny clean. I also clean bottles found in the dirt or lakes coated the same and no problems. These are bottles from the twenties to forties. I would be careful with an old bottle before that time. Gretchen.
 

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