These tablets are designed to penetrate, dissolve, and remove odor-causing residue that accumulates inside your dishwasher over time, as well as remove lime and mineral build-up. Using Affresh tablets once a month can prolong the life of your dishwasher and make it more effective at doing its job: cleaning your dishes.
Promising review: "Works extremely well. We haven't done any cleaning on our dishwasher in five years, and the sliding dish trays were tough to pull out or push in, there was detergent build up all over the inside, and there was a milky film on all our cups. I bought Affresh, ran the dishwasher with two tablets while it was empty, and the difference was astounding. There was still some build up and I figured it would require another cycle, so I popped another two tablets in, ran the machine a second time, and now it looks and sounds brand new. No more film on the glasses, no more dirty dishes from clogged sprayers, no more odors, or build up around the door seals. I'm going to be buying Affresh from now on, and hopefully it will extend the life of my dishwasher." —Martoune
Get it from Amazon for $5.99.