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Usually it is varnish inthe system that gums things up. You would probably be ok with Seafoam. I have used Marvels Mystery Oil for years to clean out PS systems and have never had a problem. I would add a resovoir worth of MMO and leave it in for a week or two. I once left MMO in for over 7 years. I had to repair a power steering line while out off roading. No one had any ATF as we all had manual transmissions. A friend had a quart of MMO behind his seat. I filled up the resovoir and started up the engine and continued to fill it until it read full. I never got around to changeing out the fluid after that I just forgot about it. Now mind you it was power recirculating ball and joint not rack and pinion so the system held a lot more fluid then a modern rack and pinion system. When THe vechile was about 13 years old the power steering pump started to go out so I put a junkyard pump on it. The fluid still looked great but was rather thin. That is when I rembered what I had done. THe system was completely clean.