Dexron/mercon in ATF+4 power steering?

So today our Wynns rep told us that there mercon/dexron power steering flush is fine for flushing chrysler products that require ATF+4. I can't find anything anywhere that says that this is o.k.? He also claims that he supplies Various chrysler dealerships with this product and they use it to flush there vehicles that require ATF+4?

What do you think?

Don't flush anything....

It will cause a mountain of problems after.

You would be surprised at the amount of problems that have been fixed with a simple power steering flush!