FDA, Questions and Answers on Current Good Manufacturing Practices-Equipment https://www.fda.gov/drugs/guidancecomplianceregulatoryinformation/guidances/ucm124777.htm
FDA, Validation of Cleaning Processes (7/93), GUIDE TO INSPECTIONS VALIDATION OF CLEANING PROCES https://www.fda.gov/iceci/inspections/inspectionguides/ucm074922.htm