If you need to clean it, because of excess rust or dirt, pick up a bottle of Breakfree. It's a great cleaner/lube for guns/knives. Use a toothbrush or something similar get into the crevices. Wipe down, and use a Qtip to get inside the scales. You may want to let the breakfree sit for a while/overnight, then wipe down. I would not soak the stag in anything, and keep it relatively dry. You can lube, but then wipe down quickly. I'm not a fan of soaking stag in anything. If you intend on cutting food with the knife, then use a little mild soap/water on the blade only. Afterward, wipe down with a little vegetable/olive oil to keep it rust free.
Just one of many opinions.