About Odonil Natural Air Freshener: Odonil Natural Air Fresheners are available in 'Block' formats. Odonil Blocks are small space fragrances that can be used in your bathrooms, home, toilet, cupboards, etc. Odonil Natural Air Freshener has nature-inspired fragrances that last up to 30 days (about 4 and a half weeks). Odonil Natural Air Freshener comes in a range of four exciting fragrances Orchid, Rose, Lavender & Jasmine.