Discards the images that are no longer in use. Note that you cannot remove a particular image directly by ID, for it might be used in multiple sheets, or they can be referenced by the undo/redo queue. This function acts like a "garbage collector" — it checks which images are no longer needed, and removes them.

Example

<div id="spreadsheet"></div>
<script>
var spreadsheet = $("#spreadsheet").kendoSpreadsheet().data("kendoSpreadsheet");

// Add some images then remove them
// Later cleanup unused images
spreadsheet.cleanupImages();
console.log("Unused images cleaned up");
</script>