Nippon ... Depends on where as to wheter you use the liquid form or powder - both are ideal for stopping the little ******s. Whilst sorting my late mothers house there was an infestation. Put a few drips on a large washer on the route they took to and from the nest. Within 10 minutes they were queuing up to drink and after an hour a refill was needed. Repeated te following day - and that was it GONE. If you can get close to the nest, open it up and use the powder.