A composition that can be used to treat a wide spectrum of gram positive and gram negative bacteria, including but not limited to those in biofilm form, can be used in cilia-containing areas such as the sinus cavities and middle/inner ear, while resulting in no, or very minimal amounts of, deciliation and/or loss of function (e.g., ability to clear material from the sinus cavity). Where such a targeted treatment area includes or might include a biofilm, the composition often can detach and assist in removing the biofilm from affected tissue.