Sprinkle baking soda where they come in or wash with solution of water and baking soda using a brush - 1 part baking soda and about 3 to 4 parts water - so it leaves the drying soda slightly visible...will kill the ants and others will not return!
Cinnamon or vinegar they hate
Hi Debbie - Those little buggers are relentless, aren't they?!? This is the most effective method and all-natural spray DIY that we use with ants. It's best indoors, but will also work outside with more frequent applications. Hope this helps! Hugs, Holly
Cinnamon or vinegar like Tess suggested if you do not hate the smell of both. You can also make ant bait made with sugar and baking soda.