In Cambodia people get infected with germs contained in the water they drink. Word warning and explanations that it is dangerous turned to be not effective.
But people like karaoke singing there. So...Think out of the box.
The video and words of some songs were changed as to world view of those people so they get it quick and right. For example, "you are loving me, I am loving you - so let`s take care of each other and drink healthy filtered water". That worked. Really.
How are you delivering message to your audience ?