Clover mites are tiny insects that feed on clover and lawn grasses - among other plants - during the warmer months of the year. The damage they do to plants is very minimal and they are not dangerous to humans or pets. However, they are capable reproducing in massive numbers and are sometimes known to invade homes. While even inside the home they do not present a danger, their presence in large numbers can be unsettling. Most of the time they will congregate on window curtains and other fabrics where they can be easily dispensed with using a vacuum cleaner. If an insecticide is desired, Permethrin is a safe and effective one to spray indoors to combat them.