diff --git a/backup.go b/backup.go
index 02ab0be..cb116ab 100644
--- a/backup.go
+++ b/backup.go
@@ -25,6 +25,28 @@ func getBackupPath(gridDir string, game *Game) string {
 	return filepath.Join(gridDir, "originals", game.ID+" "+hexHash+game.ImageExt)
 }
 
+func RemoveExisting(gridDir string, gameId string) error {
+	images, err := filepath.Glob(filepath.Join(gridDir, gameId+".*"))
+	if err != nil {
+		return err
+	}
+
+	backups, err := filepath.Glob(filepath.Join(gridDir, "originals", gameId+" *.*"))
+	if err != nil {
+		return err
+	}
+
+	all := append(images, backups...)
+	for _, path := range all {
+		err = os.Remove(path)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 func loadImage(game *Game, sourceName string, imagePath string) error {
 	imageBytes, err := ioutil.ReadFile(imagePath)
 	if err == nil {
diff --git a/steamgrid.go b/steamgrid.go
index bf8578a..74dc841 100644
--- a/steamgrid.go
+++ b/steamgrid.go
@@ -72,15 +72,17 @@ func startApplication() {
 
 		fmt.Println("Loading existing images and backups...")
 
-		// From this point onward we could delete the entire grid/ dir, because all relevant data is loaded in 'games'.
-		// We don't, and this builds up useless files (TODO), but is better than accidentally deleting data.
-
 		i := 0
 		for _, game := range games {
 			i++
 
 			overridePath := filepath.Join(filepath.Dir(os.Args[0]), "games")
 			LoadExisting(overridePath, gridDir, game)
+			// This cleans up unused backups and images for the same game but with different extensions.
+			err = RemoveExisting(gridDir, game.ID)
+			if err != nil {
+				fmt.Println(err.Error())
+			}
 
 			var name string
 			if game.Name != "" {