is there any way to remove the migrate example content types?

Are you sure you actually "uninstalled" the module? Or did you only disable it? Disabling the module does not remove anything, you need to take the second uninstall step to remove the content types/tables/etc. In the UI, from the modules page click the Uninstall tab. With drush, do both steps:

drush dis migrate_example
drush pm-uninstall migrate_example

I've uninstalled (really!) the migrate_examples, migrate, and even features, both via the Drupal UI and drush. The migrate_baseball content type persists. Any new ideas about how to get rid of it?

Sorry, meant to re-open this.

This is, specifically, the migrate example that requires features. I'm not sure if this problem is rooted there or here.

OK, uninstalling migrate_example_baseball will now remove the content type and its associated fields.

The Migrate example nodes types for beer and wine are not removed when I uninstall migrate example.

I checked the code in the files beer.install.inc and wine.install.inc, during uninstall they remove the taxonomy but they do not remove the schema.