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No Soap-Radio!
Wikisimpsons - The Simpsons Wiki
No Soap-Radio! is a brand of shower radios.
History
Homer listen to a waterproof radio called No Soap-Radio! in the shower.
Behind the Laughter
"No soap radio" refers to a practical joke in which a group of people tries to get someone to laugh at the punchline of a joke that doesn't make sense or isn't funny.