I’d like opinions about the effectiveness of bug foggers. I’m talking about the typical ones in a can made by Raid and Hot Shot. I don’t use them in living areas, I typically use them a couple of times a year in crawl spaces. I don’t have any particular bug issues, but I might not have had any anyway. It’s kinda like the septic tank treatments that are flushed down the toilet. How do you know if it really works? I’ve read some glowing reviews, and then I’ve read some that indicate they are no good. Some say they are more of a repellant than a killer; therefore, bugs that might have hung out in your crawl space might move to the walls and rooms of the house. Opinions?