How do I get Extremely Dirty Cog in GW2?

Check the Acquisition and "Sold by" sections, which list the vendors, containers, salvage sources and achievements that grant Extremely Dirty Cog, where known.

What is the Trading Post price of Extremely Dirty Cog?

The live buy and sell prices are shown at the top of the page, pulled from the official Guild Wars 2 Trading Post API.

Rare · Default

Extremely Dirty Cog

This seems to be the cog that Collector Terksli told you to take to Rikka, who's hiding in Rata Sum. If you had a cleaning rag, you could probably clean it. Double-click to clean.

Soulbound on Acquire

No crafting, acquisition, achievement or collection data is available for this item yet.

Item data from the official Guild Wars 2 API. Acquisition, salvage and collection data from the Guild Wars 2 Wiki.