Cleanliness control is implemented by:

Setting Cleanliness Standards: Defining acceptable contamination levels based on ISO cleanliness codes.
Regular Monitoring: Performing oil analysis to detect particle counts and moisture content.
Continuous Filtration: Using inline or offline filtration systems to maintain oil purity.
Preventive Maintenance: Scheduling filter replacements and system inspections.
Training Personnel: Ensuring proper handling and storage of gear oil.
This systematic approach maintains optimal lubrication conditions.