Yeah. I was skeptical too. But I paid 10 cents for a packet and tried it out.. and now, I'm a believer. Seriously, the citric acid in the Lemonade flavor (the only one that works) is great at wiping out stains. So, buy a little packet, pour the contents in your soap dispenser, and run a cycle with no dishes.
You'll have a stain-free, non-smelly dishwasher! Trust me. I tried it.