Last Resort consists of highly concentrated solvents and odor control essential oils that overcome the most obnoxious types of malodors. Last Resort is recommended for use as an odor control booster in heavy or severe situations. Last Resort, as the name implies, is recommended for use as an odor control booster in heavy or severe situations. Last Resort is never used by itself: it is always used as an additive to another product. Last Resort is never used undiluted, and because it is so highly concentrated, it is important to use this product at no more than the recommended concentration rate.