I know here we are talking about the way to speak and relate but I think good manners with things that are not said but done might also be included. For example, I have always taught how important is to care public places so much as your private ones. So, this is something I have ingrain.
I always carry bags to put the litter in when eating out or water and soap to clean my doggies’ pises.
If I drops something, I don’t have any problem to picked it up or do whatever to clean. I don’t care if there will be workers who are gonna clean later. I think we are all responsible to care.

I notice some people think that I’m exaggerate in that but it’s not a big problem for me or for anyone to be clean with your surrounding.