Abstract: Anaerobic livestock manure, comprising an admixture of feces and urine, is deodorized by topically applying onto the manure an aqueous deodorizing-mixture of a suitable iodine ingredient and an oxidizing agent. Preferably, the aqueous deodorizing-mixture comprises elemental iodine, potassium iodide, and alkaline hypochlorite oxidizing agent which has a long term shelf life. For urine-deficient manure piles, wherein urine has been pumped or otherwise removed from the manure feces, the deodorizing-mixture product desirably further contains non-urinary ammoniacal material, such as ammonium nitrate.