The best replacement for demodex is sarcoptic mange.

The best alternatives to demodex are rated as following:
★★★★★  sarcoptic mange
★★★★★  sarcoptes
★★★  morgellons
★  sarcoptic

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Speaking about demodex, one probably shouldn't forget about advantage multi.

Other search terms related to demodex and their ratings are:
★★★★★ advantage multi
★★ promeris
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