Premium Allercleanse Nasal Spray, Medical Grade Manuka honey, MGO 600. What Does Allercleanse Do? Medical Grade Manuka Honey Allercleanse detaches allergens, pet dander, bed mites and other environmental microbes from sinus cavities, allowing for a more thorough cleansing than saline alone can provide. Allergic reactions cause the sinuses to become very moist, providing an ideal breeding ground for microbes that then form a nasty biofilm attaching to tissues. In this mucus-filled swamp, microbes multiply, eventually blocking nasal passages and making breathing and sleeping difficult. Because Allercleanse is a super cleanser, tissues that are raw or sensitive may sting at first but within a day or two that stops. It is normal to sneeze one to three times after use. This is part of the cleansing effect of removing unwanted mucus and sinus junk. Blow the nose gently and easily.