Brown Circles Hardwood Floors

I recently came across a condition on a hardwood floor i had not seen in my 25 plus years as a consultant.
Brown circles hardwood floors. The homeowner was convinced the flooring was defective and wanted the floor replaced. Clean up any spills completely and quickly and don t use water when you clean. Poor maintenance and bad cleaning habits have led to many hardwood floors getting destroyed. The most important thing to remember about caring for your wood floor is to keep moisture away from it.
The homeowner told me the black spots appeared soon after the floor was resanded and had become increasingly worse. I have engineered wood floors that have been here since i moved in 8 years ago there has always been one dark spot that kind of looks like a burn mark as if someone placed something too hot on it. Pet mess urine vomit and poop water spots ink blood stains and food spillage are the leading causes of stains on floor. Dark spots on hardwood flooring are commonly the result of some type of liquid that has soaked into the polyurethane finish and top layers of wood.
Dust and sweep your floors daily. The gulf coast area home was late 1970s construction with a concrete slab. Last january i was commissioned by a flooring manufacturer to inspect a prefinished 3 inch engineered oak floor that had developed dark spots. Vacuum and mop with a spray hardwood floor cleaner weekly.
A red oak floor littered with tiny black and gray spots.