evidence: It explains that the wall gecko is poisonous and that to chase it out of your home, you should crush garlic with salt and put this mixture in the nooks and crannies of your house. This seems to be the source of the meme. But no evidence is provided for the gecko being poisonous. [...] According to Animal Diversity Web, a database run by the University of Michigan in the US, "geckos are non-venomous and harmless to humans".