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This duo creates an olfactory and sensory barrier: non-toxic for you, but deterrent for them.
A few additional precautions and tips:
Renew the mixture every two weeks or so to maintain its effectiveness.
Regularly clean areas where you’ve seen geckos. Fewer insects = fewer geckos.
Seal small cracks around windows or doors: these are their favorite passageways.
Ventilate your home well to limit humidity, which also attracts mosquitoes… and therefore geckos.
And if that’s not enough?