Deer perform public service
I've lived at my house for almost 30 years. I've had poison oak and deer for that time. It's in an area that I can see but don't go into. I occasionally have it sprayed or spray it myself.
It is gone. The deer ate it all. It took them 29 years to get around to it. They finished off my agapanthus and then moved on to the poison oak.
There things that deer won't eat, things that they eat and things they just haven't got around to eating.