The translation of "Abschluss" in English is "Conclusion" or "Completion".
Dear Dr. Höllering,
this is worth a few more Euros to me:
Thank you very much for the patience with which you answered the questions and remained objective throughout. You have helped me a lot!
One last note: Earlier you mentioned the "smell of using a solvent". On that day, I did not use any solvent, but actually only water, yet the pungent smell occurred when wiping. I hope this fact does not weaken your statements, as the shoe was particularly stressed?
After you have given one last hint on this topic, you are, at least as far as this matter is concerned, relieved by me.