Mold on flower arrangement

As the result of a mild summer (not running the a/c---leaving doors
and windows open) and a lot of rain, my mother's house has been
attacked by mold, especially some of her silk flower arrangements.
The particular arrangements which have been attacked also have some
eucalyptus (sp?) in them and that is what has suffered the most from
the mold (the other items seem somewhat immune). Is there anything to
do or any product to use that will get rid of the mold?