I have always been a prewasher...I wash my dishes my hand, then put them in the dishwasher with a standard liquid detergent. I got a sample of these, and was really skeptical about them taking off stuck on food without a prewash. But, I decided to give it a go. I made enchiladas and left the baked on gunk on the pan and tossed it in the dishwasher. It came out spotless - and the glass was MUCH clearer/cleaner than normal (I used a Pyrex dish). Awesome! These bad boys save me so much time and clutter in my sink. I even had a pan with a nasty dark black stain from baking, and it came out almost completely clean (after a post wash scrub, I found the stain is permanent). These are a little pricier than I would normally spend on dish detergent, but as a mom of 3, I fill the dishwasher at least once a day and these save me so much time its totally worth the few extra dollars!