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In addition to all the previous answers and resources, media used to convey WASH messages have covered virtually all areas: from posters to songs , music videos, street performances, radio programs, paintings, street murals...
There are plenty of resources online (SuSanA and WEDC have interesting resources), and I believe many more that do not make it to the web.
Here is my personal top three of sanitation messages:
My preferred initiative is probably Poo to the Loo, by UNICEF India WASH Team: catchy theme song, powerful (though little gross) animations www.poo2loo.com
Second comes the Super Truck Trump: the sludge truck card game by Skat and EAWAG https://www.skat.ch/publications/prarticle.2005-09-29.5069774463/skatpublication.2014-06-06.2559745667
Last, but not least, a Sanitation Rap from Liberia, from Youtube https://www.youtube.com/watch?v=AYGMHC96NfI