Car is making squealing noise

Can't really hear it over a computer but serpentine belts are a common cause of a squeal. Check it for proper tightness, (with the engine not running of course). Also try dribbling a little water on the smooth back side while the engine is running and the noise is occurring. If the noise changes, pulley misalignment or a worn belt are the likely suspects along with a spring-loaded tensioner that is rusted tight in the released position.

Don't use any type of belt dressing on serpentine belts. Even in the rare event it quiets the noise for a little while, dirt will stick to it making the noise even worse.