It's always a good idea to clear history, cookies, and cache on your iOS-based devices so they don't slow down. Performing this chore periodically frees up space, too. Here's how to do it.
First, navigate to Settings, Safari. At bottom, you'll see this.
Just tap on an entry you want to clear. To confirm, tap Clear (or similar choice, depending on the iOS device).
This tip will work for your iPad, iPod Touch, or iPhone!