If you want to kill mosquitoes naturally and effectively, drink coffee.

as an additional simple method to attempt to repel mosquitoes from both indoor and outdoor areas. Several research conducted since 2003 have validated its efficacy as a natural repellant, and it comes highly recommended by the American Environmental Protection Agency (EPA). Here is a straightforward method to harness its full repelling potential.

The coffee grounds should be spread out on a foil-lined plate and left in a cool, dry spot until they are fully dried.

Put it on a table or balcony and light it until it starts to smoke; the coffee grounds burn slowly and steadily, driving insects away.