Do these ultrasound devices actually work? I always thought that was mostly snake oil, or that animals rapidly become desensitized?

Cats keep pissing in/near my bike shed, i have a wifi camera successfully wired up to a YOLOv8 object detector (to detect cats) but never figured out how to actually repel them. I wanted to go with an actuated water spray but it seemed ridiculously over engineered. If i can just blast them with ultrasound that's a lot easier to do...