It also weighs the safety limits, pet concerns and cleaning habits that determine whether this natural citrus peel ant repellent will give lasting relief. In UK kitchens, ants trailing from bins and skirting boards prompt homeowners to try using citrus peel, especially grapefruit zest, as a gentle deterrent. Citrus peel contains aromatic oils that many insects dislike, and ants are especially sensitive to them. Why citrus peel and grapefruit repel antsIn a typical nest of black garden ants, workers navigate by laying and following chemical trails. Grapefruit peel spray, safety and making results lastFor a stronger deterrent on stubborn routes, infuse grapefruit peel in white vinegar.