ONA Spray Use it Everywhere! ONA Spray is a spray bottle loaded with ONA odour neutraliser. If you have smokers in your family, have pets that go everywhere in your house, have an unpleasant garbage area or would you like the air in your home or office to smell fresh and clean, then use ONA spray! ONA Spray comes in a convenient 250ml (8oz) bottle, and it is all you will ever need to tackle your household odour problems. It’s a true odour neutraliser, unlike some brands that just scent the air. The advanced chemistry, developed over several years, seeks and destroys any odourous molecules that are airborne rendering them null and inert and permanently removing the odours from the air.