Finish is the brand I’m familiar with, although there may be others. It’s very simple to use and always gives me good results. So why use a dishwasher cleaner? It removes hard water buildup on the heating element in the bottom of the machine. We have very hard water where we live now, so I like to use a bottle of cleaner every three months to remove the hard water buildup. Having a heating element that isn’t getting hot enough can leave your dishes less than clean!
I frequently find coupons for this product in the Sunday paper insert, so keep your eyes peeled and grab some when it goes on sale.