Originally Posted by Jdoughs

Build a sitemap, submit the sitemap upon every site change/update you make.

Establish a routine of constantly updating pages/content and calling the spider every time you update (by updating the sitemap and pinging them) and they will come to find the new content, and update accordingly.

I have a couple sites now that have their cache's updated live in google, literally 3-4 minutes after updating them. And this is how I do it.