I bought an older apartment with wooden floor, so I have no idea what kind of wood is it, what protection was used for it and what actually is that dirt. I was trying to clean it with soap water. Result of "cleaned" kitchen floor.
- Something was cleanable (great)
- Yellow arrows, I was dark spot which I cleaned but I still have this stains which looks like wet
- Red arrows, I could not cleaned it at all. This mess seem to be inside of the wood
How can I clean the floor and not hurt it? I prefer solution without sanding.