My favorite and most used is laundry soap. We made a video when I first made it. I made it look so hard! But it was fun and the start to a great money saving adventure. If you dont do it you should. Three simple ingredients: FelsNaptha, Borax and Washing Soda. I make 10 gallons at a time and fill the same jugs I had saved for a few months before I started making laundry soap.