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If, after making and using your detergent, you discover you need a little extra boost of clean, then add the Oxy Clean on your next batch. Another idea is to make one gallon without and one with for items with tougher stains. However, I've done both and really truly, the one without gets my stains out just fine.
I found this recipe (which I altered slightly) here. This is a great site, which also has a recipe for a thicker laundry detergent developed first. It is more work to make, but you may find it more to your liking.