I've never heard this one, but I'm going to give it a try.

I usually make sure I drink plenty of water and brush my teeth and tongue.
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Hard to tell if some are kidding or not. Hydrogen peroxide?? are you serious? Pickled onion? Liverwusrt & onion?
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I think there are two Threads going on here 1. Removing Odor 2. Masking Odor in my opinion #2 is more effective...

as far as Gargling with HP you should be careful. Dilute 1:1 with water and make sure you dont swallow it. and I wouldn't do it too often since HP is an acid and can damage the tissues in your mouth.
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