Yes, I get them all to help cleaning up around 15-16months, and sing the "tidy up" song and use PECS symbols with pictures to show it's tidy up time. No, they're not very efficient at that age, but they get the concept. By 18 months my group is usually great at it. I also do picture labels on all toy bins, so I give a verbal direction for a specific toy and point to the bin label as well.