Can anyone tell me the amount of Neem oil I should be adding to a 500 ml spray bottle of rubbing alcohol? I am planning on using it in the coop on roosts and in crevices to get rid of any mites that may be skulking about. I don't think that I have any (mites), but I'm told it's a good preventative as well.
I want to use a rubbing alcohol solution because it's the only thing that won't freeze when it's -15° C (5° F) and we are not expecting anything much warmer than -11° C for the next while. I want to try rubbing alcohol rather than vodka, which was also suggested, because of the price. ;-)
Vodka? Haven't heard that one before.
Rubbing alcohol by itself should do, but adding any oil to it should also help. Oil by itself can do it too, simply by smothering the parasites, not necessarily due to any chemical interaction. I've only ever used Neem seed oil, not leaf oil, so much of my advice there won't pertain to leaf oil. I've only added it to olive oil, not rubbing alcohol, I have no idea what chemical reactions you might get out of that concoction. Maybe put them down separately?
Neem seed oil coagulates/crystallizes when cold enough, I don't know if the leaf oil does too, but putting down Neem seed oil in cold environments will create an opaque sort of gel that will seal the surface.
When mixing for example 500mls of olive oil with Neem seed oil for direct coat/skin treatment (e.g. on my dogs and cat for sandflea season near the beach) I used a teaspoon to a tablespoon of Neem oil to 500 mls of carrier oil/olive oil. It's powerful stuff and not safe to ingest, but the dogs and cat always licked it up. So did the sheep, and the chooks liked it too. So diluting it should keep things safer in case of ingestion.
Best wishes.