We found one dictionary that defines the word be as clean as a whistle:

Miscellaneous (1 matching dictionary)

1. be as clean as a whistle: Idioms

▸ Words similar to be as clean as a whistle ▸ Usage examples for be as clean as a whistle ▸ Idioms related to be as clean as a whistle ▸ Wikipedia articles (New!) ▸ Words that often appear near be as clean as a whistle ▸ Rhymes of be as clean as a whistle ▸ Invented words related to be as clean as a whistle