Remove SOA Domain

1. make sure that all the servers in the domain have been shutdown properly.
2. Delete your domain directory under $MW_Home\user_projects\domains
3. Delete your domain directory under $MW_Home\user_projects\applications
4. Drop the existing schemas and recreate new one using RCU
5. Remove domain from $MW_Home\domain-registry.xml
6. Remove domain from  $MW_Home\wlserver10.3\common\nodemanager\nodemanager.domains

See also: http://www.oracle-base.com/articles/11g/weblogic-11g-create-extend-and-remove-domains.php