I don't know about the mouthwash trick, but i just discovered
INSTANT RELIEF for my excruciating, agonizing earache! My best friend once
told me her doctor gave her ear drops with lidocaine when she has
earaches...after searching through every cabinet at my house and then my
mom's...i found a tube of Orajel, the label read 20% benzocaine.
Well, I filled my ear canal (GENTLY) and put a little piece of
a cotton ball just inside my ear...within SECONDS, the pain started diminishing
and in less than 5 minutes my earache is barely noticeable!! It's 1 hour
later and still no pain! Hope this is safe and helps another poor soul.