To clarify, I know that the micro-doses used in home pesticide spray cans and powders are too little to harm a human when ingested. What I’ve been wondering is about other modes of transport. Could you get the residue in your eye if you handle a treated surface that’s dry and touch your eyes directly after? and could that be a problem?
In: Chemistry
Since insects do not have same metabolism as humans, many compounds that are safe for humans (not just “not very harmful” but completely safe) are deadly to the bugs.
One of the best examples is pyrethrin, extracted from chrysanthemum flower. It is completely harmless to humans ([chrysantemuim tea](https://www.healthline.com/health/food-nutrition/how-chrysanthemum-tea-benefits-health#How-to-make-Chrysanthemum-tea) is a thing) but kills flies and many other pests.
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