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My brass stern hull drain plug is stuck. I couldn't get it loose, and while at a shop for another reason they wanted to pull it because of all the rain but after trying fairly hard, they quit, afraid they'd cause hull damage. Neither do I want to chance damaging the hull with excessive force, at least before the season's over. I suspect the former owner never took it out because he never left the boat outside when not in use. It has never seen much saltwater. After 11 years, is there something appropriate to loosen brass threads? I hesitate to use Liquid Wrench, as I've never used it on anything but steel and don't know its effect on brass (or the surrounding fiberglass, for that matter.