Northwest DC-10 from EWR-AMS. N223NW, this plane was bad, the lavs were dirty, didnt flush right, the water didnt drain properly. The seats had torn fabric, the carpet was coming up, and the floor, every time someone walked past me the floor seemed to flex, never felt that before! Just really nasty. I swear the engines sounded like turboprops on climb. Then when I got out at AMS I looked at the outside of the plane, and it too was dirty. Oh well. Ironically, yet understandable, N237NW, the plane with NW/KLM colors was VERY clean. Northwest, Never again, I only did it for the CO mileage!