The following article describes the cleaning process of an archaeological ceramic that showed a black substance covering the engobe surface. This treatment worked in an analogue way as commonly used cleaning methods developed for retouching removal on easel paintings. The procedure involves working with single or mixed solvents that are experimentally tested in order to assess their concentration and effectiveness relation. Results are compared with the so called solubility triangle in order to establish their solubility, softening and dispersion properties. These procedures are based on the variability of the chemical interaction forces among the cleaning solvent molecules and those of the substance to be removed. This paper presents an organized description of the procedures followed for developing a systematic variation of a solvent mixture in order to obtain a product that could remove the black substance without altering the engobe layer.