Need help with primer removal

[totter81770]

Ok, so I had to do some major body filling, which I used both Tamiya white and Testors filler. Anyway, I wanted to remove the layers of primer on the entire body and re-primer to get a couple of even coats. What should I use to remove the primer (first layer was Testors enamel primer, then a light layer or so of Plasticote primer)? I have used the brake fluid method of paint removal on some older kits, but see that many are going with Purple Power or Simply Green. I just don't want the removal process to destroy the body filler I have used to this point.

[Longbox55]

Unfortunatly, anything that will strip paint or primer will remove the filler, too.