I have really hard water. I use a tablespoon of "Lemi Shine" plus one small squirt of this:
I mix one ounce of Dawn Dish Detergent into a full size empty bottle of Dawn and then fill the bottle to the top with water and shake it good to mix.
Using only the Lemi Shine and the diluted Dawn DWD, my dishes come out with no spots and clean as can be. I don't taste any residue on the dishes either. That's why I quit using the packets. When I filled a glass with plain water, I could taste the soap
and it gags me. Never have that problem now.
Lemi Shine is sold at Walmart.