You just washed that polypro shirt and it smells already next time wash it with Nikwax BaseWash. This product not only removes odors it also revitalizes your base layer s wicking properties so your long johns enjoy a longer life. Use the biodegradable Nikwax BaseWash in the washing machine or sink to clean any synthetic base layers or mid-layers. Recommended for Capilene and DriClime apparel. No propellant gasses. Not tested on animals. Contains no fluorocarbon. Capacity: 10 fl. oz.