Hi there...I was working on doing my first bottling. The place that set up my first kit gave me a bunch of loose corks in a paper bag. I've read that probably isn't the best...but that aside for a moment. I am wondering what type of cork they are. I went to use hot water to rinse them off before sanitizing and something was stick to sides of the metal bowl I'm using. Like wax? glue? Does anyone know what this is and can I use these? If so, how do I prepare them?