Wow! My teenage son tends to clog his toilet and I have been plunging it for two days with no relief. I didn't want to pay for a plumber, so I Googled the issue and found this extremely effective home remedy at www.rusticgirls.com:
Three (3) tablespoons liquid dish soap in a pitcher of hot water placed into the bowl for ten minutes. Plunge twelve times and voila! - the bowl emptied obediently.
Pass it on!