What are good manners as considered by our elders?
Our Elders say following what they say, lay a path which we need to follow so that our life is very happy without any problems.
though it is common for any individual to face some or the problems. But if we follow their path then our life is the best with minimal problems.
Good manners also include to be clean, neat and tidy.
Clean and Neat both tell us how you dress up that is without any dust, dirt etc. 
Follow every thing they want us to do like maintaining your room, help elders when in need. usually all good mannered persons have reached the highest posts as they themselves try to have patience and listen to whatever the teacher says and follows them.