Retired ICU nurse.
Coma? Yes. Brain dead? No. We have post partum type pads to tuck around there.
and On night shift we would bathe our patients. Comb their hair. I would talk to them. Tell them what I was doing even though they were unconscious. Rub their backs with lotion. Put my hand on their forehead and tell them we were here for them. Any body fluids were cleaned up with dignity and compassion.