When you see ants marching on your kitchen counter, here’s what you should do. Fill a few small cotton or paper bags with dry coffee grounds, seal the tops and leave them anywhere you’ve spotted the picnic intruders ( in cupboards, on windowsills, table tops, etc). You can also sprinkle loose grounds around the outdoor perimeter of your home. Ants hate the delicious smell of coffee that we love. Ingesting caffeine will kill them so they are sure to stay away for good. Just don’t forget to change the bags from time to time to make sure they won’t come back.