SQL Database ‘Project_Content’ on SQL Server instance ‘XXX’ not found – after removing project server

I keep getting this error in event viewer. I reckon project server was installed before on the farm and it has been removed but it seems its still looking for the content database see error below

SQL Database 'Project_Content' on SQL Server instance 'XXX' not found.  Additional error information from SQL Server is included below.  Cannot open database "Project_Content" requested by the login. The login failed. Login failed for user XXX\xx.farm'. 

How can i stop this and where can i inform the SP farm that it doesn’t exist anymore. Thanks in Advance