I need to put rods through my drain about every year or so due to
dishwasher detergent congealing and clogging the drain.
Using "Finish" (top brand ?) tablet detergent.
We rarely use the sink which drains to the same path, so it doesn't
get much "flush though".
I'm assuming when the dishwasher drains, it re-congeals when the
expelled "liquid" gets cold.

Any suggestions ?
Maybe a liquid dishwasher detergent ?

Thanks.