Beware of possible data missing - Maxthon 2.x
From Maxthon Wiki
You can delete browsing data using Tools > Clean History.
You can set what items to be cleaned:
- Undo List
- Address Bar History - items can be deleted one by one
- Search Bar History - items can be deleted one by one
- Cache Files
Also you can clean all the items at one time or set them to be gone when you quit.