module to safely delete obsolete drupal database tables

does anyone know of an existing module or script that will remove or ide开发者_运维知识库ntify obsolete tables in a drupal database?

The site has been upgraded from drupal 5 to 6 and 6 to 7. I know that there are many tables that are not in use or were not removed when uninstalling custom modules.

Thanks

The Schema module provides some useful reporting on mismatches between the schema that has been declared in your installed modules versus the schema as it exists in the database. That would be a good start in identifying obsolete tables.