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1. Locate their entry points and seal them.
Almost any ant colony will find its way into your home through a crack in the wall, through the air vents, and even through your open windows. Therefore, to start the your action plan for stopping the ant invasion to your home, you should first look for their entry point to your home and seal it with caulk or with other materials. If the spots cannot be sealeds, applying various ant repellent chemicals there would be a great idea. Cinnamon, garlic, peppermint oil, cayenne pepper, or bay leaves are great an repellents.
2. Keep counters and floors clean.
If you didn't know, when moving around, ants leave behind a faint chemical trail which they use to move in between a certain source of food and the nest. Wiping off their cheimcal trails continuously, they won't be able to return to their nest and won't be able to get back to the sources of food.
3. Apply insecticide on their trails.
You probably have noticed that ants usually follow certain routes inside your home. First of all, those routes have been paved with their feromone and if you just wash those routes with water and soap, they will have to send scouts once more to rebuild their chemical avenues. However, applying a mixture of 2 cups of sugar, 2 table spoons of boric acid and 1 cup of water, and spraying this mixture on their avenues and on their nests if you manage to locate the, will kill most of them. Also, you can apply any insecticide designed for ants that you can find in your local home and garden store for this job. However, keep in mind that most of them, including the boric acid mixture are toxic.
Anyway, if the problem persists, you should contact a pest control specialist. And if you live in New South Wales, AU, I can only recommend you the guys at Pest Control Bondi.