Thanks for all the responses.
I think they key point is that even if this is part of a super-informative, valuable, well-thought-out citizenship/conservation/organizational life skills project, (which it may well be), the picture it conveys to the other teens is:
"It's just the school using them to do the chores"
"It's super fucked-up, but not my place to say anything".
As for my choice of words- I am using the terminology used here. In fact, I've heard most people used the abbreviation "Sped kids", (both teachers and kids), as in "Are you sped?" "he's in sped".
I put "normal" in quotes not because I couldn't type out the word neurotypical, but to indicate that is how the kids who are not "sped" are perceived.
Also, I do not think, and I hope I have raised my children not to think there is anything menial and demeaning about cleaning. In fact, ironically enough, DS is responsible for the garbage in our household.
I just think having a "special group" of children (who are already stigmatized societally) doing jobs which are also devalued socially reinforces the wrong message, and I just hope those kids have the option not to do it, because if they were forced to take garbage whilst at school, then it really would be "super fucked-up".