One of our on-going project today is the tank preventive maintenance where cleaning is part of it. After two days of hard work, our team completed the activity and the tank is now scheduled to undergo "swab test" before using again and going back to normal operations. Since I work in a food-grade manufacturing organization, "swab test" of the tank is a requirement and I just can't express my nervousness while it was being swabbed because if it failed, we need to re-do the whole process. Thankfully, we did good the first time! Quality work the first time - first time, only time is quality! :)