Hi Marie-Claire.
There is no report you can run on the CSS file in RH but it
is dead easy to remove styles. Just open up the .CSS file in the
Project tab, highlight the style and click "Delete". You do have to
be sure that the style is not being used though if you are to avoid
getting into a mess. There are also a few .CSS editors out there -
some freeware - that can be used.
TopStyle Lite is one
I've used in the past. The one thing I would suggest before you
attempt anything is to take a backup of the .CSS files just in case
As for excluding topics from a search, you can find your
answer in
this
thread.