What's the best way to cloak AdWords and get away with it. AdWords will no longer approve our forms because we have additional ads on our thank you page. However, I'd imagine if we removed these ads AdWords will approved our ads. Then maybe we can just add them back. Then not touch make changes to our AdWords account?

Do a small experiment:
Create an empty page that logs the user agents that enter you page.
Submit that page to adwords.

See what user agent adwords use, and then filter it/redirect to another page/etc.

However, I'm pretty sure they will find you pretty quickly