Q: We have new hardwood flooring with 3 coats of crystal finish. Our dog was sick on the area rug so I used (Spot Shot) carpet stain cleaner on the carpet only to discover that the floor under the area where I used the carpet stain cleaner is now a bright yellow.
How can I remove this bright yellow stain from my new flooring?
A: I think your crystal finish is a low end water borne polyurethane. The product you sprayed on your carpet is oil based and probably contains silicone. Not a good match. I would try denatured alcohol or such to remove the discoloration but I doubt it will work. You will probably have to have at least the boards affected taken down to bare wood and re-finished.