SQL query to remove [MissingWebPart] WebPart class references from content database

I have sharepoint 2010 environment, which has previously K2 however currently it's removed. I would like currently to clean all k2 references in the content database. I am receiving the below error in the central administration 

[MissingWebPart] WebPart class [334d10fa-a50a-5f79-ffbb-2e1d5e80c15a] (class [SourceCode.SharePoint.ProcessPortal.WebPartPages.SchedulesWebPart] from assembly [SourceCode.SharePoint.ProcessPortal, Version=4.0.0.0, Culture=neutral, PublicKeyToken=16a2c5aaaa1b130d]) is referenced [2] times in the database [WSS_Content], but is not installed on the current farm. Please install any feature/solution which contains this web part. One or more web parts are referenced in the database [WSS_Content], but are not installed on the current farm. Please install any feature or solution which contains these web parts. 

I have followed the article "http://get-spscripts.com/2011/08/diagnose-missingwebpart-and.html" to locate the references. I have found the LeafName in the database however in the site collection the page is not exist. I have checked it using designer and other sharepoint management tool but no luck to found that page. I have delete the item from the database in AllDocs table and in AllDocsStream tables. But still I m receiving the error in the central administration.

Is there any SQL query to clean the references and remove the effected item from the content database.

Ali