What is an effective method for controlling spiders indoors?

Caulking structures to prevent entry is an effective method for controlling spiders indoors because it addresses one of the primary ways spiders gain access to buildings: through gaps and cracks in walls, doors, and windows. By sealing these entry points with caulk, you can significantly reduce the likelihood of spiders and other pests entering your home. This preventive measure works by creating a barrier that physically obstructs the spiders from coming inside, thereby minimizing encounters with them in living spaces.

Other methods listed, such as keeping windows open or using strong light sources, do not provide a reliable means of control, as open windows could actually invite more spiders and other insects that attract them. Allowing natural predators to flourish may help in some outdoor contexts, but indoors, it does not ensure a significant reduction of spider populations and could lead to other pest issues.