ONA Odour Neutralizing Agent has been solving problematic odours with great success. Formulated from essential oils, it will tackle the most difficult odours and literally eliminate them—no masking, no cover-up—just neutralization and elimination. The odours are gone. We offer ONA in block form, ideal for closets, foyers, attics, cars, gym bags, boats, kitchens, garbage cans, cupboards or vents. Simply remove or punch several small holes in the cap and place in desired location.