I was a firm believer in bleach until I had my first "Bandaid" beer. This was somewhere around my 10th batch. I always thought I rinsed very well, but this time I must have missed something. I had to dump the whole batch. Never again will I use bleach to sanitize. I use StarSan exclusively and after about 300 more gallons, I've not had another ruined batch. Use bleach if you like, but you'd better rinse very, very well and don't miss anything. I don't think I'll ever use it again unless it's an emergency and I'm out of StarSan.
Yikes, never dump a batch for those reasons. Time heals all wounds, as they say. Unless it was really contaminated, no reason to dump.