What effective bed bug treatment looks like
Bed bug infestations are usually treated by professionals using heat treatment, targeted insecticides, or a combination — often over several visits — because bed bugs and their eggs are tough to eliminate in a single effort.
Heat treatment raises a room's temperature high enough to kill bed bugs and their eggs, while chemical treatments target the cracks and seams where they hide. Either approach often requires repeat visits and treating neighboring units to keep the bugs from coming back. Store-bought sprays and foggers rarely solve a real infestation, and foggers can actually spread the bugs.
Because proper treatment is technical and usually needs to cover more than one unit, it is generally the landlord's responsibility to arrange and pay for it. If your landlord's only response is a single spray or a bag of DIY products that does not work, a free review can help you understand what effective treatment should look like.
This is general information about California tenant rights, not legal advice. Every situation is different.