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Residulen solves German Roach infestation with long lasting residual effectsJeff McGovern interviews Lance Corson of Corson Commercial Exterminating several weeks after applying Residulen in a restaurant that had a German cockroach infestion. After the initial kill, Residulen continues killing several weeks after application. Residulen has a 6 month residual so we’ll keep checking in with Lance Corson on this restaurant treated with Residulen for frequent updates. Residulen is an odorless 25B insecticide to kill bed bugs, roaches, carpet beetles, ants, fleas, ticks, silverfish, millipedes, centipedes and other insects.