Rentokil Insectrol Insect Killer Powder kills fleas, ants, wasps, carpet moths, cockroaches, woodlice and other insects. Provides fast, effective control in and around the home. Contains Pyrethrum. Ideal Product Contains Pyrethrum Provides fast, effective control in and around the home. This product is a highly effective insecticidal powder designed to kill and control crawling insects in and around the home.