I did that, and it was smack in the middle of dd's pregnancy! Like that's a great time to use bleach. :P I was just sick of looking at the mildew in our bathtub. I've since found that straight bleach doesn't do much against the mildew, but this tub and tile cleaner I've got that's super toxic and bleachy smelling will. I just have to spray, vent the room, walk away, and come back 5 mins later and rinse it. Minimal exposure that way, but it's still a bummer that that's the only thing I've found that works against mildew.