Hit them with hairspray when you see them. It's like spraying them with epoxy glue and they burn. We've been lucky and have not seen any down here last couple years. Might be because DH has mixture of Dawn he adds to cayenne and mint. He sprays with the Dawn and mint oil/extract then puts the cayenne in a condiment bottle with the plastic nozzle and squirts that onto the Dawn. The cayenne sticks to the Dawn and mint mix. He does this on he inside and outside perimeter of the house and around any cracks and crevices.