Fighting the ants alone is just impossible. It is not a matter of leaving out foods or stg, once they get the habbit of walking around your place they will keep on going, unless you destroy their own home , which is usually impossible to find. Leaving out parsley on their usual trails would make them go away, but they will return as soon as you remove and let's face it - you can't live in a field of parsley... So whether you like it or not, the only option is call a company to come and spray with special chemicals - they have a slow reaction, meaning that the ants will get some "food" and manage to bring it back to the other ants - everyone eats and everyone dies. I had ants at home and it took me months to figure out that you can't fight them alone. I used these guys - 0888537012. Haven't seen an ant for 2yrs since. Unfortunately, they spend most of the time in Switzerland , so call them regularly to catch them when they are here. The chemicals a professional ant fighter would use are actually less harmful then the ones you would buy from the supermarket. They are just used properly and sprayed at the correct spots. Good luck :)