Cleaning of male threads

We do bright Ni-Cr plating on brass parts having a maximum thickness of 20 micrometers at high density areas. There is no gauge problem because of plating thickness if the male threads are clean but the problem occurs even if only a little polish paste is left between the threads. Considering that excess ultrasonic power may cause defects on the base metal do you have any suggestions on chemical cleaning of male threads.

Note: We do not prefer mechanical cleaning by hand because it takes lots of time.

Thanks for your interest,

How are you presently cleaning these parts? You definitely cannot leave even a little of the polishing compound on the parts.

What temperature is your alkaline cleaner? Raise it to close to the boiling point, and make sure that your heat input matches work load, and use the proper cleaning formulation for polishing compound. Usually your cleaner will cool down from the introduction of cold metal, and this cold cleaner will stop working.