Dock Spacers can't get removed!

Sooo... For the sake of organisation I added in these "Dock spacers" via messing around with terminal and inserting the command "
defaults write com.apple.dock persistent-apps -array-add '{tile-data={}; tile-type="spacer-tile";}' " and then " killall Dock "
The thing is, I want to rmy computer, and to do so I want to reorganize my dock. I want to remove all of the Dock spaces I have right now and add new ones later after I finished remodeling everything else (folders, aliases, etc.)
My problem is that I can't remove the dock spacers. I'm unable to select them and remove them from the dock like instructed on every other Dock Space related webpage, this includes moving them around (they're practically empty spaces that can't be altered). Any hints on how to fix this?
My operation systems are:
Macbook air (2011 or 2012, can't remember) Mac OS X Lion 10.7.5

This could be due to MCX policy settings used to manage your dock. These can be used to integrate to Open Directory in an OS X server environment, Active Directory (with the right tools and/or configuration), or other LDAP directories.
Look for '/Library/Managed Preferences/<yourshortusername>/com.apple.dock.plist' for this one.
Another possibility is that one of these two locations carries the configuration:
/Library/Preferences/com.apple.dockfixup.plist
/System/Library/CoreServices/Dock.app/Contents/Resources/English.lproj/Default.p list
You can use the plist editor from the XCode toolset or use the 'defaults' command from the command line to edit these.
My money is on MCX.

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