"homemade "mucus" is the problem. Why doesn't she just order some mexican laundry detergents. Foca, Roma, even Arial is available online. Will save her time and money in the long run."
Very true. Even the Sun, Xtra, and Purex liquids outperform the laundry snot that you see in these videos, and don't leave a residue.
I have made the goop before out of my homemade soap scraps, but to have it work you need a much stronger concentration in the solution, and you need much more of the goop to work. I used a lb of soap to a gallon of water, added the borax or washing soda separately at wash time (mixed in before the soap), and it works about as well as your average detergent. Of course, I used about 2 cups of the snot in a washload....four times as much....you need some suds with soaps to make sure scum doesn't form.
Even with the sudsy mixture, it doesn't rinse as clean as a detergent, it's a mess to make, and in effective concentrations, it isn't as cheap as buying Sears Ultra Plus (which is MUCH better). It's fine if you happen to make your own soap, and a handy way to use up ugly batches on dog beds and shop towels, but it isn't a big money saver for anyone else.
The typical goop recipes you see on the web, when you figure out what goes into them, aren't significantly better than just washing your clothes with plain water. In some ways they're worse; at least plain water doesn't leave a residue.