Only a few drops are enough to erase your gecko problem.
The substance attracts the gecko with its pleasant smell, and as soon as the gecko tastes the substance directly, it falls dead in a very few minutes in it's place.
Without a smell.
The product is used many times and for a long time, because you do not use it each time except for several drops only to kill a group, so the product will remain with you for a while.
In order to preserve the product for a long time, it is preferable to keep it in a cool place and also to close it tightly after each use.
It is preferable to put it at night when the gecko goes out to catch insects.
Do not expose it to the sun for long periods.
Do not keep the box open for a long time and close it well.