I wrote this program a few years back and have used it with success. Lately my company is using it to clean up backgrounds that we receive from our clients. It basically runs a single lisp routine of your choice on a batch of drawing files.
Directions for install and use are included in the zip file.
If you find it useful let me know.
-Adam Carlson P.E.
Mechanical Engineer
DuPont Engineering
Portland, Oregon