Regular laundry detergent will probably work better that dish washer detergent. I recommend laundry detergent crystals.

Step 1: Get Some Water

Step 2: Get a Bag

Step 3: Mix Only Use a Little But of Water

Mix the substances and your bag will start to get warm. It won't be much but it is still pretty cool.
<p>I didn't believe you, but I looked it up and you are right.</p><p>One of the ingredients in detergent is Sodium Carbonate, which has an exothermic reaction with water- meaning that, yup, it heats up when wet.</p>

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