Our solution is a spray on formula made from Non-Poisonous, Mint Scented, Biodegradable mineral oils creating a physical and scented barrier that lasts for years! This in turn Will prevent them from getting in your houses, cottages, boat houses, kids camps, trailers, boats & restaurants whilst also keeping them out! (in addition it's been proven to work well on otters and beavers and drive them away extremely Efficiently.)