What a pain.
Decades ago we lived where deer were a problem. We tried everything, hair from barber shop, soap, cayenne, Sulphur and eggs, coyote and bobcat urine, nothing worked
My sil's sister told me after hearing about the cayenne pepper, " you know Jolana, they are Tx deer, you know they love pepper !"
We have them in the front here but just have plants that they won't go near.