Never mix bleach with other cleaners. If you’ve already tried a plunger with dish soap or a commercial drain cleaner (especially acidic ones like Drano), adding bleach can create toxic chlorine gas. This gas can burn your lungs and even be fatal in enclosed spaces.
The short answer:
When your toilet clogs and the plunger isn’t cutting it, it’s tempting to reach for a strong chemical like bleach. After all, bleach breaks down organic matter and disinfects—so why wouldn’t it work on a clog?