Remove URLs from Google’s Index

From here

1. Ensure the URL shows a 404 when you access it.
2. Surf here

1. Wait 3 to 5 days.

It turns out that Google will delete pages from the cache if and only if it gets a 404 from the url (I assume there must be some timeout ???). By simply removing the server from the net we did not get the file out of Google’s cache and it sat there for four months.