What to use when replacing the power steering fluid?

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I was recently told by a mechanic that I need to replace the power steering with fluid that has "stop-leak" because of some trouble I was having with my vehicle. My manual says to only use Dexron-II Automatic Transmission Fluid, but as I understand it Dexron-II and Dexron-III are no longer manufactured. The only power steering fluid I can find with stop-leak is Prestone, but should I use power steering fluid or brand transmission fluid for my power steering?