I appreciate your detailed description and documentation of issue very much. Nice work.
Can you give me some additional information concerning:
- when did defect occur first time? Beginning of this year?
- is defect seen all days with the same level, i.e. amount of spots on the surface? Is it the same every day? If not, I propose to repeat trial with panels and evaluate surface after zone 1-5. You can even do evaluation of units. But please remember to evaluate surface in dry condition/in areas where surface is dry. I cannot see clearly, but this picture after rinse looks like already having this defect…
- did you do fresh make-up of dip rinse and activation in PT beginning of this year?