A friend of mine who lived in Ft. Lauderdale came up with a doozy of a concoction that worked within a matter of 2 weeks, and no cockroaches ever stepped foot into her home again! Even the ants left. Wear gloves for this and use a container you can throw away. Take a tin of sweetened condensed milk and add boric powder to it, mix until it turns blue, and into a texture whereby you can roll it into soft balls, and place them in soda bottle caps, so the mixture does not touch the surface you want to place them on. Its advised to only place in areas where children and pets cannot reach or get into because of the poison. She had all the exterminators she could find come and spray, they even had their home bombed, but still the little buggars kept coming back, until she tried this, and boy, she has spread the good word.