by Jon (Updated on 2015-10-11)
The Game Cleaner feature deletes resources that you're not using in your game. Specifically, it deletes resources that used to be a part of your game (you deleted them from the app), but for whatever reason, still exist in your game's folder.
How to Run the Game Cleaner
The Game Cleaner is located in the app's main menu via Debug > Game > Cleanup Unused Files....
We recommend backing up your game before using this feature.
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This feature DOES NOT REDUCE THE FINAL SIZE OF YOUR EXPORTED GAMES.
This feature only affects the on-disk size of the game.