Abstract: In this paper, the working theory of ancient syrup and the science behind such cleaning
methods are discussed. Analysis reveals that saponin and sorghum seed aqueous solution is a multifunctional
biological cleaning solution, which contains natural non-ionic surfactant that not moisturizes but also
suspends dirts, produces few foams, and rinses easily. In the meantime, it disinfects efficiently, protects
colors and paper, and removes acid. Its related cleaning techniques and the specified water temperature are
all supported by science.

Key words: Ancient, Painting cleaning, Syrup decontamination, Saponin, Sputum nucleus, Surfactant, Enzym