How to clean up Yum mess?

Sat Mar 3 14:50:54 UTC 2012

On Sat, Mar 03, 2012 at 14:48:47 +0000,
  Arthur Dent <misc.lists at blueyonder.co.uk> wrote:
> 
> It was the latter (2 copies of e.g. qlibc) so I ran 
> package-cleanup --cleandupes
> This caused me to take a bit of a deep breath as it also wanted to
> remove various dependencies and amounted to some 50 packages to be
> removed.

I usually keep track of the extra stuff that gets removed, so that I
can put it back after things get cleaned up.