Sorry to burst your bubble, Sailfish, but save your cayenne pepper for cooking. It will have no affect on the squirrels whatsoever.
I literally dumped it into the side stalk indentations of all my banana plants and watched in horror as they simply ate them like a salad in front of my eyes.
In fact, I have lemon trees, and they will even pull the lemons off the trees and eat them as well.
I don't think there is anything they will NOT eat, so anything organic just doesn't work on them.
I still hope someone will post who's used the Baar castor oil because I'm not going to spend anymore money on "repellents" that claim to work and don't. If anyone's actually used this with good results, then I'll happily spring for the gallon! Otherwise, it's lethal methods for me from now on.
