You can purchase over the counter pesticides. Some of these over the counter pesticides use products with ingredients and chemicals that merely attack the nervous system of the pest. Bradenton Pest Control However, once this particular product dries, its effectiveness is completely gone. In these cases the only pests it will effect are those who have direct contact with it while it's wet. So, when you spray (for instance) a cockroach or two, those two will die but the 20 or 40 in hiding can very well be untouched and alive still multiplying rapidly.