I tried the straight peppermint oil in the coffee and could never get the ratio just right that is why I decided to mix it with coconut oil but that way may work out perfectly for you. I was putting coconut oil in my coffee for other reasons and decided to combine them. Oh, and when I can find Boston Creme Donut Kcups I put the peppermint coconut oil in that too and it is delightful.
I am with you on the citronella...not my favorite smell. It smells like soap to me. I do use an essential oil coop spray everyday made from Rocky Mountain Oil "Purify" (main ingredient is Lemon Grass) and lavender essential oil. I have used it every day for the past two year and we never have a bug problem in the coop. Thanks for the tip about the castile soap. I will go add some to my concoction. Now, maybe I won't have to shake the bottle so hard.
I think I will make up a bottle of your peppermint version and spray it around the back porch. A woman at our local chicken club meeting was telling us the other day how that she had 1 vanilla tree hanging in their coop and her husband (thinking he was helping) put up 5 more!! She said within 30 minutes her ladies were coughing. It is amazing how delicate their respiratory systems are.
Has it been super hot up your way? It is RIDICULOUS here. At 10:15 am this morning the heat index was 97. That means it will be 107 around 2:30. I cannot wait to get out of here!!! When I wake up and there is condensation on the windows and the AC is set at 76, I know it is going to be a tough one.