Here's a cheaper alternative. :-)
Step 1: Gather Your Items
-apple cider or distilled white vinegar (do NOT use balsamic or red wine vinegars, these can stain your dishwasher)
Step 2: What to Do!
Depending on your water you may need less or more vinegar.
Place right side up in top rack of dishwasher.
Load your dishwasher with dirty dishes and dishwasher detergent.
Run as usual.
Let dishes dry, remove and enjoy spotless dishes.
*Edit: This is not a detergent replacement, it's a replacement for products like jet dry spot free rinse.