Process to delete few existing organizations from the system

Hello All, We have a requirement wherein Business has plan to decommission two organizations and want to remove the data totally from Demantra. If there is any standard process to delete the org and org related data then please let me know . We are also listing down the tables we need to clean up . We know mdp_matrix and T_EP_ORGANIZATION keeps the org info and sales_data table its related data. We you have a clue of any other table we would need to consider. Quick response is much appreciated. Regards, Sakshi Thakur