I can't say that I noticed a difference - but i will say that doing a flush will probably help.
I know that chemical properties of the old fluid I had in the reservior made it appear Nasty compared to HONDA power steering fluid out the bottle.
Happened that a leak developed in the return hose near the block, so I replaced the hose - and vacuumed out the old fluid and filled with new stuff x2.
KNLNGUS