How to remove old kernel entry in GRUB (non-funcitonal one)

   This is what I did to remove an old, non-functional kernel from my GRUB. I don't know how it even got there on the first place, because I had another, working xanmod entry. 

In any case, please proceed with caution when doing it. 

    ls /boot/vml*
  sudo mv /boot/vmlinuz-manjaro-xanmod ~
  ls /boot/vml*
  sudo grub-mkconfig -o /boot/grub/grub.cfg