The best replacement for pyrethrins is permethrin.


The best alternatives to pyrethrins are rated as following:
★★★★★  permethrin
★★★★  resmethrin
  pyrethrins

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Speaking about pyrethrins, one probably shouldn't forget about piperonyl butoxide.

Other search terms related to pyrethrins and their ratings are:

★★★★★ piperonyl butoxide
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Google Trends

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pyrethrins
permethrin
resmethrin