WSS : Delete orphan records in sharepoint

We can use stsadm -o databaserepair  to delete orphan items
Please check out the msdn article http://msdn.microsoft.com/en-us/subscriptions/cc288636%28v=office.12%29.aspx

List of stsadm operations

Here is the list
http://msdn.microsoft.com/en-us/subscriptions/cc288413%28v=office.12%29.aspx

Workflow Auto clean job property in Sharepoint

You can check Workflow Auto clean job property by using the following stsadm command 

stsadm –o setproperty –pn job-workflow-autoclean –pv “daily at 6:34:00” –url http://siteurl