Candidate Wifi networks are auto-selected when you launch the app; you can review the list, then press the "Clean Me" button to remove unused networks. It is safe to remove open networks -- you can easily add them back at a later date by selecting them from the list of available Wifi networks.
Note:
- This app can find certain Wifi profiles that are not displayed under the normal Android settings list
- Some Wifi network profiles are embedded into the vendor firmware and cannot be removed