Hi!
If you want to clean up your hack with the latest methods, it's a good idea to start fresh. Deleting the game like Dr. Kawashima may remove the hack entry, but it might not be enough — there could still be files left in the NAND or on the SD card.
I recommend first backing up your NAND if you haven't already. Then, format your SD card and follow a recent guide, like the one on WiiU.guide.
And if you're looking for something fun to do in the meantime, you can check out https://krikya-best.com/. It's an easy-to-use online gaming platform with plenty of options if you're curious.
Good luck with the re-hack!