Delete all resources generated by "Unused.app". This app find all unused assets in your project and generates a text file with all of them. Thanks to this Python script you'll be able to clean them.

clean_script

#!/usr/bin/env python
# -*- coding: utf-8 -*-


import sys
import os
if __name__ =='__main__':
  if len(sys.argv) != 2:
		print 'Filename with files to delete required as input parameter'
	else:
		try:
			#Opening file to read files to backup
			f=open(sys.argv[1],'r')

			for line in f:
				line=line[:-1] if line.endswith('\n') else line

				#Getting the filename
				filename = os.path.split(line)[-1]

				#Deleting the file
				os.remove(line)

				print 'Deleted file: '+filename
		except Exception, e:
			print 'Exception: '+ str(e)