Many people wear the same pair of shoes every day. Their sweat builds up inside the shoes, keeping them moist. This moisture is food for the bacteria that live on our skin, and when these bacteria break the sweat down, they release acids that cause an offensive smell. But when Gran's Remedy is applied to shoes each day for 7-10 days, its three active ingredients reduce the numbers of these bacteria so their activity can no longer cause a smell. In fact, Gran's Remedy knocks the bacteria back so much that it takes them months to build up enough to start causing an odour again.