Conventional paint strippers are usually very toxic substances that you’d be better off not bringing into your home. But one company, Green Products, has created a bio-based paint stripper and solvent called aMAIZEing.
It is a proprietary blend of U.S. grown corn and soybean esters designed to strip and remove paint, adhesives and mastics from concrete, masonry, wood, metal and a host of other surfaces. It can also be used as a degreaser. See the aMAIZEing home page for more information. See also this soy-based paint stripper from Soyclean.