Carcinogen 1,4-Dioxane / Ethylene Oxide Free Tested by Independent Laboratory Certified Eco-Friendly New! 2X + Powerful Vegan Product Septic Tank Safe Leaping Bunny Ecologo Industrial carcinogenic contaminants 1,4-dioxane and ethylene oxide are regularly found in household products. This ATTITUDE product does not contain these by-products listed as carcinogenic to humans by the State of California Proposition 65.