What goes in it
Three things, and she says they are ingredients you probably already have in your home: Dawn dish soap, pure baking soda and hydrogen peroxide. She mixes it in a little dish and notes you could make a bigger batch, but she is going with a smaller batch that day. In the second video she says the peroxide is just the regular kind you can get at Walmart.
The third ingredient changes with the fabric. For white clothes, sheets, pillowcases or anything a creamy color she adds a teaspoon of the hydrogen peroxide. For something with a lot of color in it, like the dark purple shirt she is working on, she adds a teaspoon of plain filtered water instead. Her reason is simple: she does not want to take a chance on putting a faded spot on a colored garment.
How Lynn mixes it
For the small batch she uses about a teaspoon of the Dawn and a teaspoon of the baking soda, then the peroxide or the water, and mixes until it comes out almost like a toothpaste, like a paste.
Her white-clothes video gives the same idea in tablespoons. A small batch there is one tablespoon of Dawn, one tablespoon of peroxide and a tablespoon of baking soda, or until it forms a paste, and she says you may have to use a little bit more or a little bit less. For a batch big enough for six shirts she eyeballs it, starting with a good two heaping tablespoons of blue Dawn and around two tablespoons of peroxide, adding about two tablespoons of baking soda, then working in a little more until it forms the paste she is looking for. She says you can go thicker or runnier than she does.
On colored clothes she is cautious in that video too. She says you can test it on colored clothes, but for herself she would use it just on whites, and that if you want to make it for colored things you should either test it or maybe even leave the peroxide out. She keeps the peroxide away from the pink shirt she is wearing for the same reason.
How she puts it on the stain
She applies it with an old toothbrush, putting a little of the mixture on the brush and scrubbing the grease spots directly. In the white-shirt video she works the same way, coating each individual spot real good with the toothbrush.
Then it sits. In the first video she scrubs and washes; in the second she lets the shirts sit around an hour before they go in the washer. While it dries on the fabric, she points out the baking soda coming out as the Dawn dries, which she says helps release the grease.
Leftovers keep. She suggests saving a bigger batch in a little baby food jar or any small container, or a jelly jar. In the end she just keeps hers in the bowl she mixed it in, with a lid on it.
How it turned out on her shirts
The first shirt is one she has had seven or eight years, with sausage grease stains picked up cooking while camping. After one trip through the washer she looks it over close and says she thinks they all came out, and that the mixture will take grease out of clothes.
The white shirts get a more mixed report, and she says so plainly. On the first one you can barely see two spots, though a dark one is still there and she may re-wash it. The next white shirt has no spots left, and she says that one done excellent. The old t-shirt with the stain she could not identify came out too, except for one little dark place.
Her reason for making it at all is money. She calls it a cheaper way to do laundry when you are on a budget, using what is already in your pantry, and in the white-clothes video she says she is trying to get the tough spots out without having to buy bleach.
Follow the labels on every product you mix, and test any cleaner on a small hidden spot first.