For kids who are say, 9 and up, if it is something they should know to do by now because it is part of a daily routine, I would give a consequence for forgetting to do it. If my 11 year old "forgets" to take out the trash, I don't remind him-I give him a consequence. If my 13 year old DD "forgets" to clean the kitchen after she makes herself lunch, she gets a consequence.
They are never going to take ownership and do what THEY KNOW TO DO if you keep nagging. At what point would they be motivated to take responsibility and remember on their own if you are always telling them/reminding them/nagging them to do it?