After my daughter wore this once on holiday it went really dirty looking. I couldn't get it cleaned whilst on holiday. Lucky we were organised and had extra swimsuits. When we got home I washed it in the machine a couple of times, it still came up dirty. I couldn't understand. My partner said it could be mold growing on it. Which scared the heck out of me. So I decided to cut it up. I found Sand stuck between the two layers of fabric. Never had this happen with a swimsuit before.