How do I Remove WPMU Plugins from Rogue Clients Websites I don't have Access To?

Hi WPMU Team
I no longer manage or have access to the WP Dashboard of many of the websites that are still using the WPMU suite of plugins I originally installed.
How can I remove the WPMU suite of plugins from websites that I don't have access to but are still free-loading on my dime?
Thanks for any help!