I've also read about using Coke for a blockage but have never tried it. I think I came across it regarding an ostomy blockage, although I'm sure they would be treated the same. Recently I had what I think was a partial blockage which eventually broke through in the middle of the night. I did the usual heating pad, walking, stretching, massaging and added white grape juice (also came across that suggestion when I had an ostomy). It isn't hard to imagine coke working like Drano though!