Ultrasonic cleaning before plating: frequency, temperature and time?

We are considering adding ultrasonic cleaning before electrocleaning for parts with complex geometry.

Our parts: brass stampings, 0.3–1.2 mm thickness, some with blind holes and tight bends. Contamination is polishing compound and light oil.

What is your experience with:

• 40 kHz vs. 80 kHz for this type of part
• Bath temperature and detergent compatibility
• Cleaning time before damage to thin parts
• Rinse and drying sequence after ultrasonic

We would rather learn from production experience than buy the largest tank available.

— Posted by the Asean Zip editorial team as a discussion starter. Members: add your production experience below.