I used the free plug-in Polaroid Dust and Scratch removal.
Checked the Light Dust option and adjusted the sliders to their lowest effective settings.
Followed up with a little sharpening, but unsure how much was really needed without seeing more flower detail.

forum discussion: http://forums.dpreview.com/forums/read.asp?forum=1006&message=27650924
section of original by Ed Kelly:

retouch by Twilight, using Robert Mizerek metehod: