The second grade teachers at the school I used to teach at have an end of the day routine where they play a song to signal the end of the day. When
their students hear the song, they begin cleaning up and packing up their belongings. That song is Yakety Yak by The Coasters.
I introduced A to this a few months ago. We practiced a few times and it stuck. Now, whenever I see that her toys really need to be wrangled up (because she isn't playing with them), I'll just play that song and she immediately begins cleaning up. In the photo above, her rubber ducky is helping her clean. :) It's such a great tool and I'll let you in on a little secret...the song motivates me to clean for those two minutes too!