How To Delete Nelo Theme Options?

We used the WPMU Nelo theme on our primary site for a couple years, it served us well.

Last year we switched themes, but I notice our Site Settings and wp_1_options table are littered with what looks like entries specific to the Nelo theme. I stopped counting at more than 50 rows of data that seem to be related to a theme we are no longer using.

Is there any simple way to safely delete options table entries for the WPMU Nelo theme that are no longer necessary? Or, can someone provide a complete list of db tables/rows that can be safely dropped if we do not intend to switch back to Nelo?

Thanks in advance for any feedback!

PS: I did search, but couldn't find any similar discussions about this.