Compared across 10 stores. Prices are checked against each store and labelled with when. As an Amazon Associate, Deal.ai earns from qualifying purchases.
It checks today's price at every store, compares the alternatives and answers in about a minute.
Arm & Hammer Super Washing Soda is a liquid laundry booster and household cleaner built on sodium carbonate. It softens water, lifts stains and brightens whites, and it is unscented and HE-compatible. The best new price is $5.38 at Amazon as of November 7, 2026, for a 55 fl oz bottle.
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Lowest price we've seen: $2.99 on Nov 8 at eBay. Tracked across 8 stores since Nov 8.
Owners treat it as a cheap workhorse for hard water, dingy whites and greasy cleaning jobs. Some find the liquid weaker than the powdered washing soda and easy to overpour.
