Purge old records from mysql ibdata1 file

Question

Is it possible to purge old records from an ibdata1 file without taking down the database attached to it?

Records that have been deleted from the database are still present when I scan ibdata1 for strings.

I am somewhat aware of how the ibdata1 file works and realize that those portions of the file will probably be overwritten in time, but I need to zero out or otherwise remove the old data so it is no longer stored on the server in any form.

Is there anyway to do this without taking down the database?