" wrote:

my dishwasher is encrusted with gritty a gritty substance inside, I
hope this cleans not only the dishes but the machine too!

If it doesn't, you'll need to clean the interior with vinegar (a mild acid), or
that doesn't work, a dilute CLR solution.

BTW - If you read the links provided in another post, you'll discover that the
gel detergents without phosphates perform much worse than the dry detergents.