Big Bang Theory Quote
Sheldon: Your argument is lacking in all scientific merit. Now, it is well established Superman cleans his by flying into Earth's yellow sun, which incinerates any contaminant matter and leaves the invulnerable kryptonian fabric unharmed and daisy-fresh.
Howard: What if he gets something kryptonian on it?
Sheldon: Like what?
Howard: I don't know. Kryptonian mustard.
Sheldon: I think we can safely assume all Kryptonian condiments were destroyed when the planet Krypton exploded.
Raj: Or it turned into mustard kryptonite, the only way to destroy a rogue kryponian hot dog threatening Earth.
Leonard: Raj, please. Let's stay serious here.
Quote from S02E11 - The Bath Item Gift Hypothesis