This is a very common problem that people face when they try to remove mop and glo with chemical that is usually available in the market. The truth is, using chemicals will make it worse. So, what can you do? Use a good scrubbing brush and mix some dishwashing liquid with hot water in the bucket. You need to use hot water because when you try to scrub the stain, the heat of the water will make the stain loosen up. Even though the water is hot, make sure it's not hot enough to burn your hardwood floor.