george the janitor tidied up the restroom so well it's not simply [spic and span], it's as clean as your mother's reputation
"basically, this term means that you can't get something any cleaner (or purer) than it is
"george the janitor tidied up the restroom so well it's not simply [spic and span], it's as clean as your mother's reputation" What is the definition of "clean as your mother's reputation"?