Liquid CO2 washing, like supercritical fluid CO2 washing, relies on the high solvent power of CO2,[4]: 275 but at lower temperatures and pressures, the latter making it simpler to implement. Because liquid CO2 does not have the solvent power of the supercritical fluid, agitation and surfactants may be added to improve the effectiveness of the method.[1] Liquid CO2 has been used in dry cleaning and machined parts degreasing.