Soap, a complex molecule, is both water-loving and water-fearing. Shaped like a tadpole, the soap molecule has a round head and long tail; the head is hydrophilic, and the tail is hydrophobic. This ...

including some newer brands like Grove Co., which comes in a recyclable aluminum bottle. We are also testing Dawn’s newest and purportedly most powerful dish soap, Dawn PowerSuds. Wirecutter is ...