NOVELTY - Non-bonding compound is removed from absorber layer of absorber substrate during a cleaning process, which involves setting conditions of a solution in a solvent tank used to clean the non-bonding compounds from the absorber layer of the absorber substrate; calculating thickness of a boundary layer formed on the absorber layer in the solvent tank during the cleaning process; setting circulation speed of the solution in the solvent tank during the cleaning process; and immersing and cleaning absorber substrate in the solvent tank under the set conditions and circulation speed of the solution.    USE - The method and system are useful for removing non-bonding compound from absorber layer of absorber substrate (or from respective absorber layers of each of absorber substrates) during cleaning process (all claimed), preferably for removing non-bonding compound from polycrystalline materials on solar panel.    ADVANTAGE - The method is able to effectively extract and remove the undesired non-bonding compounds from grain boundaries of polycrystalline material of the absorber layers of the solar panels at fast reaction rate. Since the boundary layer thickness increases as the absorber substrate length increases, the spacing between the absorber substrates also increase when the absorber substrate length increases for faster cleaning of non-bonding compounds on the absorber layers. Since the boundary layer thickness decreases as the circulation speed of the solution increases, the circulation speed of the solution is increased to reduce boundary layer thickness and make the solution flow faster for better clean result of the non-bonding compounds from the absorber layers.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a system for removing non-bonding compounds from respective absorber layers of each of absorber substrates during a cleaning process, comprising a solution in a tank, where conditions of the solution are configured for cleaning the non-bonding compounds from the absorber layers of the absorber substrates; the tank configured to enable the absorber substrates to be immersed and cleaned in the tank during the cleaning process, and where spacing between the solar absorber substrates and circulation speed of the solution in the tank are set during the cleaning process according to thickness of boundary layers formed on the absorber layers.