These tablets help to remove odor-causing residue as well as lime and mineral buildup naturally found in dishwashers. It is recommended to use the tablet once per month. These tablets can be used in both stainless-steel and plastic tub dishwashers.Promising review: I am glad to report that my $5 investment in this product saved me more than $500. Due to my dishwasher not cleaning properly, I was ready to replace it. I realized that my water softener was not working properly and I hired a rental company to replace it. The dishwasher performance was somewhat better. Before I bought a new dishwasher, I did two more loads. Affresh was featured in a magazine's product review. So I ordered some Amazon stuff anyway and added it to my order. It arrived, so I put one of the tablets in the bottom of my full machine and ran the regular cycle. I was shocked at the results! It was amazing to see my glassware, which I thought was permanently stained and ruined, come out looking brand new. The same goes for cutlery. It is amazing the difference. As recommended, I will continue to use it faithfully every month. It can be added to my subscribe and save order so that I get a new pack every six month. I am amazed!" SheilaAmazon offers six packs for $5.99