Kills in a single spray. Kills flying and crawling insects fast. - Cockroaches. - Flies. - Mosquitoes. - Spiders. - Ants. - Fleas. - Moths. - Wasps. - Silverfish. Mortein Fast Knockdown Insect Spray Multi Insect Killer 300g Kills in a single spray. Kills flying and crawling insects fast. Contains insecticide to kill fleas, cockroaches, spiders, silverfish, wasps, moths and ants fast. Shake can well and keep can as upright as possible when spraying.