Hi Ranarula,
There is no such thing as her bal treat ment, I agree with anil467. ’’ herbal ’’ is not only short lived but may not be herbal at all as claimed.
Boric acid is commonly used as active ingredient in baits that are claimed as herbal. This is an old remedy that my grandmother used and most of our new generation roaches are immune to it by now. My advise - ’’ herbal ’’ does not work
Better you try the gel treat ment. I have seen this work and PCI gives a paisa vasool service. No smell and no hassles. It is a ’chemical’ treatment not herbal. A known chemical is better than an unknown ’’herbal’’’ treatment !
The gel is applied in only corners and crevices and lasts for months killing the invaders.
Try it out.