Had an exterminator come in twice, and each time found live and running bugs just hanging out in plain sight on my wall only hours after treatment, plus getting a ton of revenge bites the night immediately afterwards. After contacting the exterminators company repeatedly, they had the nerve to pin it on me in a report to my landlord that it's because I didn't prep my room correctly according to their instructions. Excuse me? How come the tech didn't say a thing both times he came in to do the treatment?? Anyway, I gave up trying to argue with them and took matters into my own hands after careful research. Note that I left my room prepped the exact same way (everything in plastic bags, etc.) throughout all this, exactly as what I had for the exterminator. - Neem oil sprays. This worked and killed the bugs on contact, but the smell made me sick and gave me severe headache for the first two days straight. I had open ventilation and a fan directly blowing on my head to avoid passing out. But it did seem to do the job? Zero new bites and zero live bugs hanging on the wall...until the smell dissipated in about seven days. Immediately afterwards I had a ton of tiny bites. This meant to me that either neem oil worked by the lingering fume (which I couldn't stand to reapply), or it killed the adults but couldn't kill the eggs (which was obviously unacceptable). - Cimi Shield Knock-Out. This took a huge bite out of my wallet, but turned out to be worth every penny. I was sold on the fact that it kills mechanically kind of like DE dust, but much more fast-acting - bugs die in under two minutes after direct exposure, or within a few hours of crawling through the residue even if you miss spraying them directly. And this residue is promised to last a whole year! (Though I can't attest to this part yet, since its only been a few weeks.) Plus, they weren't lying when they say this stuff is green - you're supposed to spray directly on the mattress and even the sheets, and then directly SLEEP on them, which I did without dying or noticing anything different! The spray made my room smell like soy sauce for a brief two hours (not at all unpleasant, kind of like the back of a restaurant) and completely dissipated afterwards. The residue is mostly invisible, but where it shows up it looks like a thin white powder. Not a problem that I mind at all, especially given this is the only thing we tried that yielded a litter of dead bugs around my bed the next morning, instead of live bugs partying on the wall after massacring me the night before. Here I am over two weeks after the initial spray, and still no sign of new bites or newly hatched bugs. I will keep my belongings bagged for another three months just to be safe, but I'm feeling confident that we've got a winner here. If anything changes in the future I will for sure update this review.

This is an awesome product used in conjunction with other approaches to aleveate bed bug population. However You might want to review the non stain statement. This product does leave a white powdery residue look to darker surfaces. Just wanted others to know.