Ona Spray Ona Spray is a great product when on the move and you need to freshen up the space your in. It also works well on clothes that have an unpleasant smell on them. ONA has been destroying odours effectively for many years and is used in hydroponics and commercial applications worldwide. ONA is not only an excellent air freshener, it is a true odour neutralizer – effectively destroying bad smells. Available in 3 distinctive scents.