Which water-based solvent is banned from use?

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Hazardous solvents are restricted based on toxicity and safety risk. Carbon tetrachloride is banned because it is highly toxic to the liver and is a suspected carcinogen; even at low exposures it can cause serious liver damage, and if heated or mixed with acids it can release phosgene gas, a deadly inhalation hazard. These severe health and safety risks lead to strict prohibitions on its use in water-based systems. By contrast, methanol and acetone are flammable but controllable with proper safety measures, and water is safe, so they’re not banned.