vavavroom
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Does regular soap contain triethanolamine? It's a surfactant and may make the product rinse more cleanly. It's not in the bar soap I used for the test, and I don't think it's a common ingredient in bar soap. It is however a common ingredient in shaving soaps and creams - probably for a reason.I get really soft water too. I used to check water softness for an aquarium setup, and it was quite soft without being excessively so. But all it takes is a little bit of magnesium/calcium for soap scum. I did look up what soap scum is, and it's the result of calcium and magnesium ions interacting with stearic acid in soap. So if there's stearic acid in many commercial shave creams in a can, but that will be in a mixture that contains mineral free water.
I also looked up your product, and here's the ingredient list. You know what that is? It's mostly soap. However, I'm guessing you're not wetting it with tap water.
Dr. Bronner's Pure Castille Bar Soap contains: Organic Coconut Oil*, Organic Palm Oil*, Sodium Hydroxide**, Water, Organic Olive Oil*, Mentha Arvensis, Organic Hemp Seed Oil, Organic Jojoba Oil, Mentha Piperita, Sea Salt, Citric Acid, Tocopherol
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