How do I delete all drops?

[Hotelmariofan]

Someone on my server built a factory which was done incorrectly and it is now producing thousands of drops, is there some command that will delete all drops in the server? I had worldedit/worldguard and essentials, i know worldguard has "stop-lag" but that affects a lot more than just drops. Essentials has "/remove drops [radius]" but that only affects a certain area, I want something to clear the whole server. Any ideas? Thanks in advanced.

[Aeolos]

I think there is an option in NEI to remove all entities?

[GrnEyedDvl]

Worldguard has a remove drops command as well.

[Zaste]

if its just one person, teach them about obsidian pipes.

[jojomoep]

/remove items -1

Removes all drops on your map.