The black gunk or Biofilm is still giving me problems. The proper fix is to remove the washer fluid reservoir and give it a thorough cleaning but...that involves jacking up and removing the drivers side wheel then removing the mudguard cover to gain access to remove the reservoir!
Decided to try a sort of cyclic flush-out to avoid the above.
In the last post related to this I mentioned that the passenger nozzle jets clogged up again - just when I thought I was done. Removed the nozzle from the bonnet as shown to check and yeah...clogged with black gunk again.