Sodium Sesquicarbonate, the Best Floor Cleaner?

Some years ago, I was renting a room in a house. In the utility room was a box of a product called “Dirtex,” which could be used for, amongst other things, a floor cleaner. Because I needed to clean a floor that day, and it was handy, I tried it. It worked wonderfully.

A glimpse at the ingredients showed that it was mostly “sodium sesquicarbonate,” a compound new to me at the time. It’s basically a double salt of sodium carbonate (a.k.a. washing soda) and sodium bicarbonate (a.k.a. baking soda).

I couldn’t find that product after I moved to Bainbridge Island, but the grocery store here sells both washing soda and baking soda, and I have a gram scale. So it was a simple matter to weigh out 286 grams of washing soda (being a decahydrate, it has a high molecular weight) and 84 grams of baking soda, and mix the two.

No, that’s not making true sodium sesquicarbonate unless I dissolve and recrystallize the result, but given that I’m just going to be dissolving it in a bucket of mop water, it makes no difference to the resulting solution. And yes, I’m sure there’s a little bit of variation as the powders separate and settle, but mopping the floor isn’t a precision science. It works well enough.

Which, to the best I can recollect, is about as well as the commercial product worked, which in turn is quite well indeed.

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