There are several ways to kill mosquitoes instantly, including:

• Insecticides: Indoor and outdoor insect sprays and foggers can kill mosquitoes on contact and are effective for several weeks.

• Repellents: Repellents work instantly by making mosquitoes less likely to approach the person or area to which they are applied. They do not kill mosquitoes, but make them less likely to bite.

• Fly swatters: Mosquitoes are relatively easy to kill with a fly swatter, hand, or another flat object.

• Diluted isopropyl alcohol: A mixture of equal parts of 70% isopropyl alcohol and water can be sprayed on mosquitoes to kill them.

• Mosquito traps: Mosquito traps can be sprayed with insecticides or diluted isopropyl alcohol to kill mosquitoes.

It is important to note that there is no 100% effective way to instantly eliminate mosquitoes, and the success of different methods may vary depending on the environment and mosquito species. Additionally, some methods may have negative effects on beneficial insects or plants.