code: function cleanupRepliesCache() {
  	const keysToRemove = [];
  
  	try {
  		for ( let i = 0; i < localStorage.length; i++ ) {
  			const storedReplyKey = localStorage.key( i );
  
  			// cleanup caches replies older than a day
  			if ( 'reply_' == localStorage.key( i ).substring( 0, 6 ) ) {
  				const storedReply = getItem( storedReplyKey );
  
  				if ( storedReply && Date.now() - storedReply[ 1 ] >= 24 * 60 * 60 * 1000 ) {
  					keysToRemove.push( storedReplyKey );
  				}
  			}
  		}
  	} catch ( e ) {
  		debug( 'couldnt cleanup cache' );
  	}
  
  	keysToRemove.forEach( function( key ) {
  		removeItem( key );
  	} );
  }
docs: Clears out state persisted reply cache
  
  @alias cleanup
  
  When filling out a reply to a comment,
  the text is saved in `localStorage` to
  prevent it from disappearing on accidental
  page refreshes, browser closes, or navigation.
  However, we don't want to pre-fill a comment
  reply if the saved version is older than a
  certain period of time: in this case, one day.
  
  @returns {undefined}