My house came with a not so great dishwasher and we have very hard water. This is the only detergent I've found that actually gets rid of spots on my dishes. Seriously, cups that I've had for 5 years look brand new. I use cheap stuff for the prewash, then only have to fill the rinse half way for this to work. Plus, it's environmentally friendly. Only downside is it's expensive for the amount you get. But if you use it like I do, it will last awhile. I can find it at the grocery store or Target.