Customer originally says they have unsealed real hardwood that was recently installed. First hired us to remove a stain that no one else could (including the manufacturer supposedly). Tech tested an inconspicuous area and tried the polish before treating the stain. Stain was removed polish worked great, happy customer. Calls to have all the flooring cleaned. Cleaned and polished a month later with Bona - same as before. Happy customer. Almost 5 months later customer says they are getting spots on the hardwood. Looks like bleach spots where little drops of color are fading in specific areas only. One being in the hallway near a bathroom. They have a dog and a housekeeper. (Cleaned their tile as well that had stains that tech said were probably from cleaning products used by housekeeper that the tech removed and they were pleased with results) Fastforward to now, he contacts the manufacturer and they say its oil based engineered. My question is, if it were a chemical reaction would it have taken 4-5 months to have some sort of reaction? And would it occur only in certain areas? Also the initial stain removed a month prior to that is still holding up well in the kitchen. I’ve looked up the flooring manufacturer reviews and found a ton of bad reviews. Also found a few customers stating that water drops immediately wiped up will even bleach their floor.