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KD coupler problem

Bought several packs of KD #805 couplers. They are all infected with some kind of grayish-white substance. Does anyone know what this is and, more importantly, how to clean it off?  Even scraping doesn't work very well.

Original Post

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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