I have tried a few of these homemade laundry recipes with great success. I have not tried the vinegar yet in the rinse cycle. From what I have read it works really well.
I use Phel's Naptha for the bars and instead of hand grating mine I found an old manual flour grinder that does the trick. It really is an easy process and can save a ton of money. Not to mention, it's probably better on washer and clothing.