I have a 2004 Alero with a 3400 SFI engine and recently had my transmission serviced (flushed & new fluid) and I was told that my power steering system was dirty. I was wondering how to go about flushing the flushing the power steering system?

How many miles do you have? It may look that way but doesn't mean it needs to be flushed and replaced. Auto mechanics and shops are always looking to make money off you. What condition is the PS fluid in visually when you wipe it on a white paper towel?