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We've come a long way from the sixties, from dropping acid, to spraying it on the side of a house. What a country. But seriously, Acid based power washing detergents contain active ingredients like Hydrofluoric, Hydrochloric, Sulfuric and Phosphoric acids. Alkaline based power washing detergents contain active ingredients like Sodium Hydroxide, Potassium Hydroxide, Sodium Metasilicate and Limonene.
You don't want to mix bleach with any of these active ingredients because you could cause a fire, release of hazardous gases, pressurization in a closed container, which could lead to an explosion.