
(Even the best detergents can’t remove every stain completely.) Using cool water, we wash swatches in two identical washing machines with each detergent, then allow the swatches to air-dry. We use stains that are exceedingly hard to remove so that we can detect real differences among detergents’ performance. Here’s how we determine which detergents fight the good fight: In the lab, CR’s test engineers launder fabric swatches that are saturated with blood, body oil, chocolate, coffee, dirt, grass, and salad dressing. “Most detergents sold today are liquid, and their popularity-plus the increase in sales of pods-means that few powders remain on store shelves,” Moomey says. As for powders, you’re likely to find your choices have narrowed in recent years.

Strips are better for the environment by reducing plastic but seem to lack the ingredients or concentration levels to do the job. Our tests reveal there’s a chasm between the best liquids, pods/packs, and laundry detergent strips, which tested poorly in our labs. And cleaning power also varies depending on the type of detergent.
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However, our tests find that even within a single brand, performance varies from one formula to the next (for example, Tide Plus Ultra Stain Release scores higher in our tests than Tide Plus Bleach Alternative). But generally, shoppers tend to fall into one of two camps: price-based-they buy what’s on sale-or brand-loyal, says CR market analyst Kelly Moomey.

“The scent is extremely strong,” says another-and they were both talking about the same formula. How do you know which superlatives to believe and which detergent to choose? Some CR readers tell us they have strong preferences, especially when it comes to the detergent’s scent: “Great smelling,” one CR reader commented. And that’s not even counting so-called natural or eco-friendly options. Stroll your grocery store’s cleaning aisle and you’ll see a rainbow of products boasting Marvel hero-like superpowers-Ultra Oxi, Stain Fighter, Power Pods, O 2 Blitz, Boombastic Clean.
