The surface of the shell is made with a few layers of hard wax oil. The treatment protects against discoloration and creates luster and a protective surface. The products we use are harmless and are also used on toys.
KEEPING YOUR CASE CLEAN
The case can be kept clean with a slightly damp cloth, for worse stains you can use soft soap. Do not use too much water as wood absorbs moisture. After long use, abrasion can occur and the surface can be affected, you can then polish with sandpaper and apply hard wax oil (matt and clear) if you want to regain the original surface.