Dear Saowanee,
Sorry for the delay in replying, due to a loaded business trip.
My reply is as follows:
I have taken a look at the photographs: many tubes look unsellable indeed. Some other tubes look better (and could possibly be cleaned).
Question: how many of the tubes mentioned in the 2 Excel files are unsellable?
Looking forward to receiving your reply.
In the meantime I will once again check with our laboratory how to clean GWC tubes and how to clean GOC tubes.
With best regards,
Leo van Wuijckhuijse
Export Area Manager Asia-Pacific