Chases Mice Away! 2 Pack = 60 Days of Effectiveness!! PIC® Natural Mint Mouse Repellent uses a natural formula with a fresh mint fragrance that is proven to repel mice. PIC® Natural Mint Mouse Repellent is effective for up to 30 days each. Use one packet in each enclosed space accessible to mice including drawers, cabinets, closets, pantries, under sinks, attics, points of entry –even vehicles.