Novartis Pharmaceuticals Corporation 1 article published in JoVE Chemistry Failure of Cleaning Verification in Pharmaceutical Industry Due to Uncleanliness of Stainless Steel Surface Imad A Haidar Ahmad1, Andrei Blasko1 1Analytical Research and Development, Novartis Pharmaceuticals Corporation The lack of a well-defined procedure that consistently cleaned coupon surfaces was identified as the major contributor to low and variable recoveries in cleaning verification. This manuscript describes the correct protocol of cleaning stainless steel coupons.