got into this due to the super laundery sauce recipe, which in modified form is sweeping through my workplace (Sussex Health Centre, Sussex New Brunswick).
We love it! Since Fels-Naptha soap isn't available here, I looked at its ingredients

and discovered it's almost identical to Sunlight laundry soap, which has been around since I was a cub using it on my mother's scrubbing board. So, I substituted that for the Fels and it works like a charm. Cheers to all of you out there who, like me, hate being fleeced by corporate giants and marketing liars peddling glitz and no substance.