system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does wasp killer spray kill on contact?
gpt
For the RAID type spray, the chemicals are a nerve agent (for the insect) that penetrate through their skin and cause paralysis and nerve damage.  They can't move, they can't breathe, and they die (painfully).

For other insecticides, the chemical may cause uncontrolled muscle movements, or prevent the insects from growing from the egg stage, or destroy their digestive tracts.  These are longer-term insecticides, and are less harmful to humans.