Wooden glasses is a unique product with it's own character and particular properties. Despite glasses being furnished with water-protective oil, this product is not designed for use in water. In case of contact with water please remove it with cloth.
If your glasses got dirty - please use attached sanding paper (or any sanding paper of 220 and higher grain). After dirt removal finish sanded area with attached oil and leave it for 10-15 minutes. After that remove the leftovers with cloth.