Have you made any efforts to teach your LO manners outside of please and thank you?

I remind her to greet and say goodbye to others, especially older people like her great-grandmother. I don't tell her to say it, but I always address people with sir/ma'am. I usually have her sit at the dinner table until everyone is finished (or close to it, she's only 3). But we've unfortunately not done much in the way of thank you cards and the like.