Clear Browser Cache
As of version 2015 R1 you can find the custom steps in the Step Builder under General section.
This step will clear all cookies, temp files or history from the active browser.
You can choose some or all of them.
This is useful when you want to start a clean test without saved information (like user name and password), or saved state information ("logged in," last visit date, preferences, etc.).
Safari doesn't support clearing cache.