I've just got around to reading the users' manual for a Bosch dishwasher which informed me that there are _three_ types of detergent; one with phosphates one with phosphates and _chlorine_ (bleaching agent) one with neither phosphate nor chlorine.
Apparently _chlorine_ is included for cleaning (obscuring) stains such as tea.
[This has nothing to do with three-in-one; four-in-one etc... which the manual describes in later pages]
I've checked with all the detergents stocked at my local Tesco shop and none have _chlorine_ listed in their ingredients. Most cite >5% x