Sterilization
When you bring something into an FCA, it needs to leave the FCA. Tools, hardware, etc. This is the definition of Sterilization.

Sterilization is an underused term in FOD Control but it is the best way to ensure that FOD stays outside an FCA. Sterilization is nothing more than vigilance. Constantly looking for FOD and FOD related issues, then quickly rectifying them defines FOD sterilization.