Any tips on stripping dummies? I would really like to re-use them. I have one that is covered in fondant and then has fondant details attached (I used water).

just soak in hot water and peel it off your styro won't get soaked just dry it off and use it again

I wrap dummies in saran wrap first, makes it really easy to remove the fondant later.

I have reused my dummies several times and I use Glade Press-n-Seal. It works great though finding the right way to put it on without leaving any wrinkles was trial and error
I found it best to cut pieces to fit the tops(and bottoms if your going to attach it to a stand) and then do the sides is easiest way for me. When I'm all done with them I just lift them off the stand and peel from the bottom. I make sure some of the sides overlap enough to grab and peal off.
Hope that helps!