What kills bedbugs immediately?

What kills bed bugs immediately includes high heat, steam, and direct contact killers, though no single method guarantees 100 percent elimination of all hidden eggs without thorough application and follow-up. The fastest immediate kill is high heat, as bed bugs die instantly at temperatures above 120 to 135 degrees Fahrenheit, so steam treatment above 200 degrees applied directly to mattress seams, box spring cracks, headboard crevices, and furniture joints kills bugs and eggs on contact, and professional whole room heat treatment heating rooms to 120 to 135 degrees for several hours kills all stages including eggs. Boiling water kills on contact but can damage furniture. Contact insecticides labeled for bed bugs such as pyrethrins and some pyrethroids kill on contact when sprayed directly, but many populations are resistant and eggs survive, requiring follow-up treatment two weeks later. Rubbing alcohol 70 percent kills on contact when sprayed directly, but it is flammable and not recommended for large areas and does not kill eggs and has no residual effect. Vacuuming with strong suction immediately removes bugs and eggs physically. Desiccant dusts like CimeXa kill within 24 to 48 hours by dehydrating, not instantly. The most reliable immediate kill is steam and professional heat, combined with encasing mattress and box spring in bed bug proof encasements and washing bedding and clothing on high heat for 30 minutes to kill all stages instantly.