I like alot of these ideas. But if they continue to leave things laying around (clothes and personal effect), bag them up and put a note on the bag that says "Goodwill collection". I would cook minimally (like enough for you) or buy only the food you like. I know that today is a rough one and it's not always like this, but if they are college bound, who is going to cook and clean for them at college? You could always put up a price list of what it costs to do some of the things you are doing.