A radical way for the Iranians to clean up the mess is to replace their computers with new ones. If they have an isolated computer system, it will be necessary for the worm to be re-introduced manually. By now, they probably know how the worm got there is the first place, so they can be more careful.
Palestinian foreign minister filed report to ICC over torching of Duma home (Haaretz)
from the article: Iran pauses uranium enrichment at Natanz nuclear plant