I dont think that sucking out all the old toner with a household cleaner is a good idea. I have heard that the fine toner has been known to explode. I beleive a specialist vacuum should be used.
Does anyone now where i can get clips to cover the hole where the ink comes out of the bci3,6 cartridges. I usually refill extra cartridges so I can pop them in as and when i need them and just removing a simple rubber cover instead of tape would be ideal.