My Dad licks his plate clean after eating. Anyone else experience this?

If you had grown up during the Great Depression, you would lick your plate too.

I have never heard of or seen this!

Are you looking for advice on how to get him to stop? Always have bread available.

In the equations of things, I would just let him to that. He's not hurting anything.

Except for when we go out to eat as its a bit embarrassing .

I wish mom would do that too. I cry to see the valuable, expensive coconut oil go down the drain. She will not even spoon it up, because she is so neat and proper. She never uses a spoon on a flat plate. So she would dish her soup up and eat the solids with a fork trying to get some liquid with it. I make soup thick.
I would say, give him bread indeed. If I put bread on the table, mom will eat it and cannot finish what is on the plate.

57twin, I bet hardly anyone even notices your Dad doing that while at a restaurant. Most part, if someone does notice they are thinking "wow, I need to order what he's had, it must have been good". :)