My english is not very good.

And yes, I make a complaint about this plugin.
I'm trying to uninstall the wordpress mobile pack from my wp installation (I have a mootools and js gallery in the home page, wich it seems that is not suitable for that plugin), with some incomprehensible problems.
First, deactivate (in fact deactivated yet some days ago) and remove from the plugins page of my wp admin.
Second, enter to phpMyadmin and search in wp tables for 'wpmp', 'mobile' and 'switch': 9 or 10 entries deleted, don't remember exactly. I know some plugins leave some litle 'garbage' upon deleting.
Third, through ftp , by chance, I discover the 4 themes folders still there, in the themes root. Try to delete through ftp: impossible. Permissions problem or something similar. Tried to change permissions to 777:impossible (possible with my own and contiguous theme).
Tried to delete through admin-appearance-themes:impossible (wp says every theme is deleted, but it's not true).
Cleaned cookies, restored original wp .htaccess, checked the ftp program with no luck.
What's the matter with it?

I've seen that you recommend, to people with similar problems, to reupload the plugin and reactivate it. Why? What is exactly the involved code that prevent the complete uninstall? This seems not a serious procedure...
Any other solution?

Thanks in advance

Jan