how do I fully delete boot camp

It's very simple:

1. Launch the Boot Camp Assistant by going to your Applications -> Utilities ->Boot Camp Assistant.
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3. Click Continue on the initial Boot Camp Assistant Introduction window.
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5. Select Create or remove a Windows partition and then click Continue
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7. Click the Restore button to remove the Windows partition and restore the disk to a single-partition OS X volume.
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9. You’ll be prompted to enter your password – do so and then click OK.
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11. The Boot Camp Assistant will start partitioning…
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13. and then you’ll be back to a single OS X volume. That’s it – Windows is gone.