SharePoint Webparts :: List Collections

I installed the following product from SharePoint Boost:  SharePoint List Collection 3.0

The product is something that we dont want to use. I uninstalled the product however I now have Missing Server Side Dependencies.  listcollection.webpart

I have about 300 site collections.  Is there a way to delete this webpart from each site collection globally or with a PowerShell command?  I know where the part is located, I just dont want to go to each site collection to delete manually.

Cyber ITEngineerAsked:
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Cyber ITEngineerAuthor Commented:
Example of location is:

I wonder if there are still hidden Features enabled at the site collection or farm levels. Its possible to get at these through the object model.

Removing features from a content database in SharePoint 2010 using PowerShell

You might be able to use a tool like this one, but I'm not sure if it is compatible with SharePoint 2010:

SharePoint Feature Administration and Clean Up Tool

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I just noticed that tool from Codeplex says it supports SharePoint 2010. You might give that a shot.
Cyber ITEngineerAuthor Commented:
You need to manual delete the webpart from each site collection.  
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