>We make maintenance plan to shrink log files.
>1. Backup Transaction logs
>2. Run Execute T-SQL Statement Task
>USE [yourDB]
>DBCC SHRINKFILE (N'yourDB_log' )

Yes, this is what I do in other environment. But, that clean the entire log to 1 MB. Is there a way to have a clean of the log and keep everything newer than 30 days?