UITableView with static cells without cellForRowAtIndexPath. How to set clear background?

I have a static UITableView and everything is laid out on the Storyboard. In cellForRowAtIndexPath i simply use

return [super tableView:tableView cellForRowAtIndexPath:indexPath];

and the tableview works great. However I want to set the cells backgrounds to [UIColor clearColor] How can I do this? The table has 30 cells, each one different.

Thanks