Leiningen - way to automate removal of *.DSA and *.SF files (Clojure Maven)

Question

I'm using Leiningen to automate the creation of a single 'uberjar' from several dependencies. (For a Web Start Application).

Some of the jar files are signed, and the uberjar process brings across their signature files (which don't match the new jar). I want to add my own self-signed cert and remove the old ones.

Is there an easy way in leiningen to remove these old signing files (or stop them being copied across)? I'm doing it as a manual step at present.