It is on the sink also.
"Warning, Don't flush corrosives, down the waste tunnel" A comment about helping people, not trying to destroy them, don't get rid of what you think is bad, find a way to help it, if you are right help make it better, and learn from what you thought was bad if you find, from thinking and feeling, that you were wrong.
In other words, don't fix the corruption in many areas by just destroying them, but by helping them to find better ways if you can, and learning the parts of their better ways when you can. Since nobody is all good or all bad.
According to an episode of Farscape, although it has some reversals in it, and note the bad side thinks it is magnificent, why it is an illusion wanting light from outside, instead of the light from inside. Although it also has the concept that many people think they are superior. One of the best episodes.
It is funny, but not sure I agree with much of it :) And it also shows how it starts with negativity, then it moves to thought, and correcting problems. When in the negative influence they just hurt each other. Then when they work together it is pretty good :)
Crackers Don't Matter Part 4.
http://www.youtube.com/watch?v=lTRIGZAAbn8:D
It is pretty funny :)
(not about the oil spill, about the metaphor of ways to make things better, bring everyone up, not push people down because some person thinks someone else is corrosive :) )
And yes the hint was obvious, but for me it is about the comments :)