Anyone can help! Whenever you spot a page that has been vandalised, you are encouraged to edit it and clean it up, and/or warn the vandal using an appropriate warning template. See What to do if you spot vandalism below.
If you find yourself cleaning up vandalism frequently, you might be interested in patrolling recent changes. Note that participation is entirely voluntary. Also, you are not required to enlist anywhere.
There are various tools to help you. See the Tools section below.
