One thing I learned about hot sauce, and this is kind off-topic, but still applicable...if you are tempted to use any kind of pepper for bird feeders, well, even if you go for the powdered pepper, they get it in their wee eyesies...horrible thought. Really bad to think that you can be responsible for so much pain.
But, that being said, remember that hot sauce has SALT in it, and this is very desirable for critters...so I would suggest that powdered pepper (like the cayenne that you can buy in bulk at the International markets) is better for varmint control than hot sauce. Just a thought.
And one more related thought. The doggone bulb fertilizer, since it has bone meal in it, is VERY enticing to mammals, meaning, BAMBI. So, when you're out there, doing your fall thing in planting TULIPS (which Bambi just LOVES), and throwing in the BONE MEAL...well....need I say more?
troubles in the tomato patch
I used hot sauce trying to keep mice out of my freshly planted squash seeds. It did not work, nor did cayenne pepper. I used neem cake (very strong odor) and that kept most of the seeds safe, probably because the mouse couldn't smell where the seeds were.
How do you use neem cake?
Neem cake is the ground stuff left over from pressing out neem oil. It isn't really a "cake" but is like cottonseed meal in texture. I just sprinkle it down the row right on top of the seeds. It is supposed to supress RKN. I do know it kept the mice from eating my seeds and an added benefit was a reduction in the amount of snails in the beds. I don't know if it is helping with the RKN.