Mucus can be good, but dried strands of mucus do nothing for you. Since diary does increase mucus, if youve been a lifelong dairy consumer, then you would have more mucus than you should.
I also agree that such a diet is niether natural, nor healthy. But niether is consuming dairy, so its within the realm of possibility that you can reverse the effects of one foriegn substance with another.
Also, I have NO clue if this is true or not, that's why I asked.