Why use Earol spray?. You can also use Earol Spray once a week to aid ear hygiene and maintain healthy ears. If your ear canals are naturally very dry, then 2 squirts in each ear once-a-week. Sold by Blueberry Hearing - An authorised distributor for all Phonak, Unitron, Starkey, Sonova, Oticon, Bernafon, GN Resound, Sivantos, Signia hearing aid products, and earwax removal products.