The term 'dirt remover' can refer to two different solutions: SOAP and ACETONE. SOAP is a surfactant, meaning it reduces the surface tension of water, allowing it to penetrate and remove dirt from surfaces. ACETONE is a solvent that is often used to dissolve oils and other organic compounds, making it an effective dirt remover as well. Both SOAP and ACETONE are commonly used in cleaning products and can be used to remove dirt from a variety of surfaces.