There’s nothing quite like the surprise of finding a steady line of ants marching across your kitchen counter. They show up out of nowhere, drawn to the tiniest crumbs or sticky spills. If you’ve ever dealt with a household ant invasion, you know how quickly a small problem can turn into a major headache. Store-bought sprays and traps promise quick fixes, but sometimes the chemicals and cost can leave you just as frustrated as the ants themselves. That’s where DIY ant killer — simple, safe, and, when done right, surprisingly effective. Here’s what works, why it works, and how to keep those tiny trespassers out for good.