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Most conventional detergents contain many chemicals harmful both to your health and the environment. Petrochemicals (produced from fossil fuels, which contributes to global warming) are commonly used and are slow to break down. So are phosphates, which cause harmful algae blooms in waterways, and bleach, which is harmful to the lungs. Many chemicals can also cause irritation to sensitive skin. Look for eco-friendly detergents that contain no harmful chemicals, perfumes, or dyes, and come in concentrated solutions.