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Eventually, once you continue to 'rinse and repeat' by refreshing the page and hitting the 'magic button', you will have no more content to delete. It would be wise to set aside an afternoon, get a pot of coffee brewing, and get your mouse-clicking finger at the ready.
Or, if you continue, and learn how to use macro applications, you could even automate this process to leave it (mostly) unattended. It's not a perfect solution, but it's quite speedy and requires little intervention once it gets ticking over.
Once you see the 'This is your Wall' message, you should have no more posts to delete. Success!