I got an app with big `UIScrollView` as a root `viewController`.

This scrollView present some other views through `presentViewController` or `pushViewControler`, doesnt matter. But when i going back to `scrollView`, information, that was presented last time freeze, and i scroll duplicate inforamtion.

![enter image description here](https://i.stack.imgur.com/9CTGb.png)

How can i clean `scrollView`?