This reminds me of one of my mother's cats, Tiger.

Tiger has some very strange tastes which include mustard and - wait for it -
ear wax. I first discovered the latter interest when I spent some time on a
longish phone call while I was sitting him at my place. A few minutes later,
I heard the sound of the phone being moved in the cradle and looked over to
see Tiger licking the handset at the spot where my ear had just been. Then,
the next morning, I got awakened by him licking my ear; clearly, he thought
he'd hit the mother lode! My brother has also mentioned that Tiger has
licked his "toe jam" my brother's feet were dirty.

We've never figured out why Tiger does this but pushing him away a few times
seemed to be enough to stop the problem. He hasn't come after my ears since
that first time and I don't think he bothers my brother very much either.

Rhino