I love my dishwasher it saves me so much time and uses much less water than washing by hand. I am, however, concerned about the toxicity of dishwasher tablets/ liquids. (I am going to have a go at making my own dishwasher detergent I found an easy recipe from our home made happiness) I especially never buy the glass cleaning/ liquid stuff. Though there is no doubt that these products make your glasses sparkly.
Just add white vinegar to the rinse chamber of your dishwasher.