Without resorting to nasty chemicals, we can deal with many crawling insects. Our indoor pest repellers break up nests of ants, cockroaches, earwigs, woodlice and most crawling insects living inside the walls of your home. Flying insects are a different matter, and don't believe anyone who tells you that ultrasonic repellers are effective against them. For flies, wasps, midges, moths etc the only effective method of control is to kill them. Check out the options in the product category "flying insects".