Why aren’t all dishwasher detergents the same?
Here’s a conundrum… given that dishwashers haven’t changed in the past couple of decades and fundamental detergent chemistry hasn’t changed substantially since 1946 (source), why wouldn’t all dishwasher detergents have converged to essentially the same formula? Or maybe there would be three formulae: soft water, medium water, hard water.
Perhaps detergents actually are all the same, but there is money to be made in fancy packaging and convincing advertising? If so, why does Consumer Reports rate detergents on a scale from 19 (Cascade Complete Gel with Dawn; looks like Procter and Gamble might need to spend more time in the lab and less time making toxic masculinity commercials for its Gillette division) to 85 (Costco’s Kirkland Signature Premium pacs, which might be Finish Powerballs in disguise? Finish rates 83).
Maybe it makes sense that the eco brands such as Seventh Generation and Ecover perform badly. Or the Trader Joe’s absurdly cheap (about 1/3rd the price of Costco!) pacs aren’t great (though nowhere near as bad as that Cascade gel product, above).
But why wouldn’t similarly priced pacs from the bigger vendors all be formulated essentially the same? How is it that the folks who make Finish know something that the chemical engineers behind Cascade don’t know, or vice versa? Even products with similar prices from the same company performed differently.
[Separately, if Consumer Reports is right, you should never ever buy dishwasher gel. A Palmolive eco+ was a mediocre performer and all the rest fell on a spectrum of bad to worse. The top-end Costco pacs were the best performers as well as about 1/3 the price of the top-end brand name pacs.]
It makes sense to me that a Tesla and an Audi electric car will be different. But why should dishwasher detergents be? Everyone wants the same thing (clean dishes).
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