Force clean database log files MS SQL
The interactive tools are not working, but this script will clear a stubborn log file that won't release.
Link here
http://stackoverflow.com/questions/56628/how-do-you-clear-the-sql-server-transaction-log
Assumption: You are in simple mode
USE TheDatabase;
GO
CHECKPOINT;
GO
CHECKPOINT; -- run twice to ensure file wrap-around
GO
DBCC SHRINKFILE(TheDatabase_Logical_Name, 5); -- unit is set in MBs
GO;