Catch a nasty buzzing houseflies is not easy to do. First of all you should think about preventive measures: Install mosquito screens on the windows, check the ventilation grille - flies can fly from there. You can resort to the use of homemade fly trap - sticky trap making is simple. But the most effective is use fly traps from manufacturers - disposable, reusable or trap like a mosquito zapper. For more information about the best products in each of these categories go to our review Best Fly Traps & Repellents.