Why is there an expression “clean as a whistle?” Are whistles particularly clean?
My whistles are anyways
This one doesn’t have clear origins. One suggestion was that a whistle must be clean and dry in order to make its sound. Other suggestions refer to the whistling sound a sword makes when beheading someone, or just the clean clear sound of a whistle.
Another suggestion was that that brass whistles on trains were always kept clean and shiny.
I rather like the last suggestion.
Depends on what part of the body you use to blow it.
I think it refers to the pure, clean sound it makes.