How to deal with geckos at home: Geckos are afraid of strong pungent smell. You can put some mothballs in the corner of the room, or you can cut some onion slices and put them indoors. It is an animal that lurks during the day and comes out at night. It usually hides in the cracks in the wall or under the eaves during the day and climbs out at night to catch insects. On summer and autumn nights, geckos often appear on walls, eaves or telephone poles illuminated by lights, preying on mosquitoes, flies, moths, spiders and other beneficial and harmless animals.