Hatchet head (dragon)
Dirty cog was removed after an update.
The contents of this page no longer exist in RuneScape, and this article is kept for historical purposes.
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Dirty cog detail

The dirty cog was a quest item in the 2010 Easter Event. It is obtained by removing the components from the Dirty oven. It can be cleaned with water to obtain a Clean cog, which can be used on the dirty oven.