Bed Bug Residual Killer kills bed bugs on contact and keep killing for 16 weeks! The Bed Bug Residual Killer is an water-based deltamethrin product. The spray is specifically geared for use on the re-emerging pest problem of bedbugs (Cimex lectularius) in commercial and residential accounts. It can be used for a variety of bedbug harborage areas, including mattresses, wall-ceiling joints, baseboards, behind and underneath furniture, cushions and furnishings, etc.  The Bed Bug Residual Killer is available in a one-quart spray bottle.