Anti-Weevil spray

Anti-Weevil spray is used by Torchwood 3 to capture and contain a race of Alien living in the sewers in Cardif. Throughout the 2 seasons Jack Harkness is mainly the one using the spray but other Torchwood members have in some cases. It is stated by Jack in Season 2 that the Anti-Weevil spray neads to be stronger as the Weevils are becoming immmune.