no way man. That is impossible anyways if you do remove it they will ban you but don;t worry u won;t be able to remove it
I don't think it is possible in any way. Google will definitely monitor it. So stay away from such deeds.
You can get rid of it if you qualify to be a Premium Publisher, but I'm pretty sure you wouldn't be asking this question if you did qualify.
if you integrate/design sites to feature adsense then you can still perform well even with the ads by google. you have to remember majority of people are not savvy to what adsense or adwords are. I never found this a barrier, when you reach premium publisher status you tend to find your CPC's are higher and you get more CPM - as you get included for bigger advertising partnerships.