Chest acne

Does anyone know how I can get rid of my pimples between my boobs and on my chest. I've tried using plain soap and water and even exfoliating. I can't get rid of them. I'm going to a water park with my sister and my mom and I would want to wear a swim suit without people looking at my chest. My chest has pimples but they're not the red nasty ones. They're just pimples.