The smell was terrible for a bit, apparently. But one of my friends came over and he just got some soap, and a bit of some 409 or something and cleaned out the tub itself.
I would have done it, but I would WAAAAY to screwed up.

The smell was gone as SOON as he finished. So, I would say nah, the smell isn't that bad. Air freshner goes a long way. If your parents ask why there's so much of it in there air, simply say something like, "Would you have rather smelled my butt? Hrm?" XP