I live in center city Philadelphia and having critters, aka mice, is very typical. that doesn't mean that I wanted them as roommates! I researched more humane ways to get rid of these little guys and came across peppermint oil. I decide to give it a try. I dampend cotton balls with the oil and placed them around the house. I also sprinkled it on the carpet and by the base boards. I'm happy to say that two weeks later, I am mice free! no more droppings anywhere to be found! I would absolutely recommend this product and I plan on continuing to use it to keep any more mice away.