These insecticides are applied to soil and contain some termite lures.
You can mix the salt into hot water and ensure that the salt is completely dissolved. There are steps of Cockroach Control typically followed to free your own from the infestation. https://wiki.insidertoday.org/index.php/Reasons_For_Hiring_A_Pest_Control_Company_For_Your_Treatment_Of_Domestic_Pests