How to delete all data when uninstalling a module without going in manually in PHPmy Admin? Whenever I have a troublesome module, I have to uninstall it, then delete the folder, then go play around PhpMyAdmin to delete junk it left in my database.

This is prone to causing errors and breaking stuff...

Is there a way to uninstall modules cleanly, to delete ALL data?

I have no access to Drush on the server also...
Modules should clean up after themselves. If they aren't, you should report it in the module's issue queue.

But, at least with D7, there isn't really much that should be left in the database. Most modules that create tables delete them when they are finished. The biggest area where things are left behind is in the variables table - many modules don't clean these out. You can safely delete them after module uninstall though.