I used bleach for years and never noticed any bad in the tank. The process took a lot longer before I could use them because I wanted to make sure the bleach evaporated fully. I never got over the bleach smell in the sock though, always made me nervous and even using prime didn't help the smell. After using oxiclean I'm never going back. The socks are really clean, no odor and after 30 minutes in the dryer they can go right in the tank.