"...No disrespect to the writer of the Little House blog, but I don't see any facts in her article...."
I'm a skeptic too, so I am always on the lookout for "blue sky" theories and wishful thinking. What I was able to find to corroborate her point of view made me think this gal really has done a decent job of researching her topic.
"... The link in the article isn't working...."
The link opened up for me without any trouble to the National Institute of Health database for household products. When you go to the laundry detergent subset of the database ...
http://householdproducts.nlm.nih.go...nside+the+Home&purpose=laundry&type=Detergent
... there is a long list of laundry detergents available to research. Given that the database is from a reputable source and covers a wide variety of laundry detergents, I'm inclined to think the conclusions she's drawn about what works and what doesn't in a laundry soap are based on concrete data. Here are a couple of examples:
Here's Tide laundry detergent, powder, with bleach. I did a quick translation of the ingredients.
Enzyme(s)
Surfactant(s) <--detergent
Sodium carbonate <--
washing soda
Sodium aluminosilicate <--anti-caking agent
Sodium carbonate peroxide <-- oxygen bleach
Alkyl (C10-C16) benzenesulfonic acid, sodium salt <--detergent
Sodium C12-18 fatty alcohol sulfate <--detergent
Here's Tide liquid detergent. I translated some of the ingredients.
Fragrance(s)/perfume(s)
Fatty acids (unspecified)
Alcohol ethoxylate
Ethanol/SD Alcohol 40
Diethylenetriaminepentaacetic acid (DTPA)
Citric acid
Monoethanolamine (MEA)
Sodium Formate
Calcium formate
Sodium tetraborate anhydrous <--
borax
Laureth-9 <-- detergent
Diaminostilbene disulphonate disodium salt <-- optical brightener
Water
Amylase <-- enzyme
Proteinase <-- enzyme
Dimethicone <-- silicone
Sodium cumenesulphonate <-- viscosity modifier, solubilizer
Alkyl benzene sulfonate <-- detergent
Mannanase <-- enzyme
Liquitint Blue <-- color
Alcoholethoxy sulfate
Diquaternium ethoxysulfate
I don't see baking soda (NaHCO2) on either ingredient list. I do see borax on the liquid and washing soda on the powder, but I don't see washing soda in the liquid nor borax in the powder.
Speaking for myself, I have to say the Tide powder has fewer ingredients that are more straightforward -- detergents, oxygen bleach, washing soda, enzymes, and an anti-caking agent -- compared with the liquid. I also note the ingredients in the powder are not greatly different from many of the homemade laundry soap recipes floating around, especially the ones that don't use borax or baking soda.
But, as always, YMMV.