The antonyms for the term "clean down" are the words: dirty, filthy, grimy, soiled, stained, and unclean. These words describe the opposite of clean and can be used when referring to surfaces or objects that require cleaning. A dirty surface may have dust, debris, or other particles on it, while a filthy one could have mold, mildew, or other unsanitary substances. Grimy refers specifically to surfaces that are covered in grease or oil, while soiled and stained are used to describe surfaces that are marked or discolored with dirt or other materials. Unclean has the same general meaning as dirty, but it carries a more negative connotation.