Fornsby's finish remover, available at most hardware stores, brought a literally black 1850's walnut "kidney" table back from the abyss.
I bought it at an antique shop for $50.00, the clawed feet, the arches in the base, and the small trim around the top, made me look twice.
I took some Fornsby's to it and it literally wiped away the decades of wax, oils, polish, and crap without damaging the any of the wood.
The most robust marbling and grain appeared, and nothing but oil goes on it now. My Winchester, Mauser, and old Ward's Western Field .410, and Stoeger Coach 12g, all have been revitalized, by this simple step.
If its wood, FWIW, I stick with wood products. One day, when I get the courage, I will be consulting m25, on refinishing my grandfathers 1891 original Mauser.