DO NOT use oven cleaner or other solvents not specifically formulated for use on wood. Most oven cleaners contain sodium hydroxide (otherwise known as LYE) Lye can and will stain wood a faint green color. This is more apparent on lighter woods than dark woods, and can be hidden with dark stain.
The color is not the worst problem with oven cleaner. The real problem is that sodium hydroxide can and will destroy the lignin that glues the wood fibers together. It can make the surface wood soft and punky. So don't do it.
Use a wood stripper instead, specifically a wood stripper that is formulated specifically for woods that will be finished with clear finishes.
I highly recommend Peel Away 6. It's hard to find and pricey, but it works real well and is not very toxic or caustic. It'll strip paint, old oil finishes, varnish, etc.