Ladana writes
We discovered that our roaches are worse than we thought. How long does it take to kill them? After it dries, is it still working or does it just kill if they are directly sprayed with it?
Bifen IT does leave a residual and will continue killing long after it dries. Typically, for roach problems you would want to apply every 30 days. However, for most roach infestations spraying alone is not enough. Using a roach bait up in the cabinets and drawers along with spraying down low under and behind appliances and along baseboards is the best way to eradicate a roach problem. Of course, sanitation and cleanliness also has to be a part of the plan.
Answer last updated on: 09/18/2010
