Oven cleaner is about the worst thing that can be used on wood. Ever. Even on nasty mosin wood. Being caustic, it will damage the wood fibers. The shellac that's used on mosins comes of easily with denatured alcohol or any paint/varnish stripper. The cosmoline in the stock is best removed with moderate heat. Heat guns work, but they have to be used carefully to avoid scorching the wood. Most of the time I just throw the stock in the cab of my truck and wipe it down every hour or so with mineral spirits as it leeches out. You'll never get it all out, but you'll get enough out that you can put on a new finish of your choice without issue.
The metal is much easier. Hot water, acetone, mineral spirits, denatured alcohol, and some elbow grease followed by oil. Or after hot water, WD-40 (shudder), then oil. Just don't leave the wd-40 on it without oiling. It's a great water-displacing oil, but doesn't protect nothin' from rust.
Matt