Q: My daughter bought a house with stain that appears to have been put over the polyurethane several years ago. The stain is now scratched and looks horrible. Any advice on how to remove this stain?
A: This floor needs to be sanded to clean wood and done over. Applying a stain on top of a surface coating such as polyurethane is not going to work. Stain is meant to penetrate into the wood surface with finish on top of it.