... of this Blog will know, I regularly pick up litter from the street and place it in bins. Two reactions: older (over 40) people say "Good for you" or similar, and sometimes join in to help, younger ( especially under 25) say "Why do that? It's what people are paid to do" or similar. This latter group seem absolutely baffled by any idea of sharing a common responsibility for public places, or of doing something slightly unpleasant for the common good. Once it's explained, they can get quite interested.
Incidentally, I always carry "baby-wipes" to clean my hands.
If each of us picked up one piece of litter a day, our streets would be much, much more pleasant for us all.