Here you'll find a video how to rebuild the cleaning cassette.We're in Qld, and have a few cartridges and heads still going - but I can see the head cleaning cartridges as being a possible sourcing issue. There must be some way to get fresh paper towelling and wind up a new roll in an old head-cleaning cart...?
(I have 2 spare - so am not in panic stages yet!)
Didn't try this myself but i thought this might be helpful.
HTH
T.