Fertilizer and Repellent, testing has proven that a user can expect the repelling effect to last up to 15 days, weather permitting.The team at Guano-Gro thanks you for visiting... and wishes you all a safe and enjoyable mosquito season. Site maintained by Guano-Gro - All Rights Reserved 2010 ...productinfo Our Mosquito Repellent is an all natural DEET FREE product that has evolved from many years of testing. We learned, early on, that our pure Bat Guano, harvested from...