http://iscoresports.com/

Is there a quick and easy way to purge all old players out of the listing to start the new season fresh?

If you truly want to start over, you can uninstall and then reinstall iScore. This will start you off with no data.

forum users generally recommend not deleting past game and players and teams, instead hide them away in an "Archive league". It does not take up much memory, and Many have found, days/weeks/months / seasons later.. they wonder what happened last time. Easier to store history than to loose it for ever.