Vicks salve, Vaseline, caster oil, kerosene, even axel grease are all about as effective as the other in curing or controlling scaly leg mites.
What I never hear anyone mention is that if one bird in your flock has scaly leg then the entire flock is infected to one degree or the other.
Treat for scaly leg at night when it is easy to catch each and every bird, and then keep the treated poultry separated until you can treat all birds that night.
Repeat this treatment every week until cured, then start over in 6 months counting from the first treatment. It also helps to treat your roost poles with Permethrin laced used motor oil, this helps prevent re-infestation. You don't just feed only the malnourished birds in your flock do you? No, you feed the entire flock in kind of a prophylactic treatment against hunger. Mite, lice, and all other parasite treatments are no different.
I agree, but the oil must penetrate underneath scales. A small amount of kerosene was mixed with neatsfoot/linseed oil by my Dad back in the day, and it worked well. I've had birds that showed signs of scaly leg housed with other birds for years which never showed signs. If birds touch dirt, many will eventually get them, and older birds are more susceptible than young birds, as you likely know. Wherever a wild bird resides, so do Cnemidocoptes mutans.
The main reason effective treatment varies in success rates is due to the vigilance of the flock owner. Treating legs and feet thoroughly and often enough, in addition to housing, makes the difference. Cnemidocoptes mites will never be eradicated in the outdoors, so controlling populations on your premises and birds is all one can do. Lots of folks claim benefits of Ivermectin. Cnemidocoptes mutans does not feed upon blood, so it will not be effective. The only current type that does work is Selamectin, the ingredient in Revolution spot treatment. Selamectin exudes from pores rather than remaining in the bloodstream, killing skin burrowing mites like C. mutans. I personally wouldn't recommend it on birds used for eggs or meat.
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