There are no magic sprays that kill bed bugs very well. ... An exception is “Bug bombs”, or aerosol foggers. Foggers are mostly ineffective in controlling bed bugs. Because bed bugs hide in crevices and voids where aerosols do not penetrate, they are able to avoid contact with these insecticides.

Does spraying for bed bugs make it worse?

An insecticide that is released into a space is not going to affect them, contact them, or do anything to control the infestation." To make matters worse, bombs can cause bed bugs to flee the scene and set up camp in another room, spreading the infestation.

Does bed bug spray work after drying?

What makes bedbug sprays so effective is that they can kill bedbugs that you can't even see. The best sprays have a residual effect, which means that even after they've dried, any bedbugs that come into contact with the spray will still die.