Remove grub boot sector from a partition

I accidentally installed grub boot sector onto partition /dev/sdc1 instead of /dev/sdc, which is wrong. To remove the boot sector from partition /dev/sdc1:
sudo dd if=/dev/sdc1 of=sdc1.bootsector bs=512 count=1
sduo dd if=/dev/zero of=/dev/sdc1 bs=512 count=1
The file sdc1.bootsector is a backup in case anything go wrong.

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