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Chemical drain cleaners are among the most dangerous household products--hardly a shocker, since these lye-based formulas are meant to dissolve plugs of grease, soap, hair, and ground-up food. Yet most don't clear undersink clogs as well as old-fashioned mechanical methods, including the humble plunger.
Another surprise: Chemical products labeled "heavy duty" or "professional strength" often proved less effective than their regular-strength counterparts in clearing kitchen clogs made of grease and food, and bathroom clogs of soap, toothpaste, and hair. And two foaming chemicals, from Drano and Liquid-Plumr, tanked altogether in our tests.
Crystals, ...