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Mr. Bubble’s label lists sodium laureth sulfate and PEGs — ingredients made through ethoxylation, the process that leaves behind 1,4-dioxane, which the EPA classifies as a likely human carcinogen. Here’s the catch: because it’s a manufacturing byproduct and not an added ingredient, it’s legally invisible — it never appears on the label, so you can’t read your way around it. New York became the first state to cap it at 1 part per million in personal care products; there’s still no federal limit at all. Puracy and other sulfate-free formulas skip the process entirely.