I found a few useful information on the internet that show exactly how to do homemade dishwasher detergent. It’s very easy that you can just try it first and use some material that you can find easily at your home or at grocery store. Imaging you can save 5$ per month by using this methods. I would like to share a video from Thai DIY guy who make it easy to understand and very very good technique for anyone to do it.
I hope you enjoy it. BTW, if you are not understand Thai language you can watch more video on Youtube.