removing GRUB from sda

*** Report for internal hard disk ***

Current GPT partition table:

# Start LBA End LBA Type

1 40 409639 EFI System (FAT)

2 409640 468079487 Mac OS X HFS+

3 468342784 488396799 Basic Data

Current MBR partition table:

# A Start LBA End LBA Type

1 1 409639 ee EFI Protective

2 * 409640 468079487 af Mac OS X HFS+

3 468342784 488396799 83 Linux

MBR contents:

Boot Code: GRUB

Partition at LBA 40:

Boot Code: None (Non-system disk message)

File System: FAT32

Listed in GPT as partition 1, type EFI System (FAT)

Partition at LBA 409640:

Boot Code: None

File System: HFS Extended (HFS+)

Listed in GPT as partition 2, type Mac OS X HFS+

Listed in MBR as partition 2, type af Mac OS X HFS+, active

Partition at LBA 468342784:

Boot Code: GRUB

File System: ext4

Listed in GPT as partition 3, type Basic Data

Listed in MBR as partition 3, type 83 Linux

Ok, so I had partitioned last night and installed Ubuntu, ran into some problems with the EFI firmware, but eventually learned how to flash and fix it. Now, I had first thought it was an issue with the installation, so I tried reinstalling, but on the second time i installed GRUB to sda, not sda3. Now I have the entire EFI issue resolved, yet on rEFIt I get the extra options ("Boot EFI\ubuntu\grubx64.efi from EFI" and the old "Boot Linux from HD" which had been when I tried to reinstall Ubuntu with GRUB in the wrong spot) in addition to the "Boot from OS X" and "Boot Linux from HD" (which is my fresh new installation). Since the unwanted GRUB is on sda, not sda3, how can I access it and remove it?

Thanks.