These are dishwasher tablets:
These are dishwasher cleaner tablets:
The first ones are the ones you put in the dishwasher along with all the dirty crockery to clean that crockery. The second ones, although they’re in a pretty similar box, in identical individual packaging, and look very similar once unwrapped, go in the dishwasher when it’s empty in order to clean the dishwasher itself.
They are not the same thing.
I have just had a very stern talking to about this!