The risk is all yours! I’m not responsible for your mistakes. Be aware that this thing can very well delete all your Facebook history!
First, you’ll need:
Download Chrome, if you’re insane enough to not use it as your default browser. I recommend you to open this page on Chrome to make things easier. Now, using Chrome, go to the App Store and install Tampermonkey (link above). Once it’s installed, use the link above to access Chronikaufräumer page. Once you get there, install the script. Tampermonkey would assume this instalation, if not, restart your browser and try it again.
With everything installed, go to your Facebook account Settings/Security and disable HTTPS (Secure browser). Now access your Activity Log (http://www.facebook.com/YOUR-USER-NAME/allactivity?log_filter=all). You’ll notice that a new option called Clear Timeline is now shown right next to the Activity Log button. Click it and select what you want to do.
That’s it. If it stops deleting or scrolling the page, do it manually and the script will continue deleting everything that gets listed.
Say thank you ;)