Thank you both for the replies
I already keep my M9's in a low moisture storage container with some of those bags with crystals, so I am covered on that part!
The Ballistol is a good idea. I found out today that it is actually for sale in The Netherlands as well as those M16 cleaning kits with the brush you mention. I will try to get my hands that in the near future.
How about the wear on the knife as it is put in and out of the scabbard. I use a piece of paper around the blade to prevent damaging the knife. However I am not sure if that is a good idea in the long run. Paper and oil don't mix very well and create a mess in the scabbard...
Apart from storing the knife and scabbard separately as Mister Moon does (picture above), does anyone have a better idea?
Best regards,
Menno
The Netherlands