The gunk has been removed and bleach added, thanks to robdrinkswater.
I'm not 100% sure I understand the bacteria thing.
Daily Mail Reports..
very interestingly, that using plain-water as screen-wash risks causing fatal lung infections in drivers - shocking.
I have always used a cheap (but still proprietary) screenwash because I assume any screenwash is better than plain water. In theory a screenwash doesn't freeze as easily, doesn't leave limescale in small places, and cleans better. However, I use Rain-X to improve visibility (it's really useful in wet England) and so I thought
I don't need a premium screenwash: Could I have been wrong?
According to Dailymail, every proprietary screenwash has bacteria-killing chemicals and has been killing bacteria. Despite that claim, the tubes in my 75 gradually gunked up with bacto-slime after
adding proper screenwash. Humn... I don't know what the slime is:
1. The living bacteria? Unlikely because being stuck together would hinder their ability to feed, but not impossible I guess.
2. Bacteria poo? More likely. For example, I believe the plaque on teeth is the bacteria poo (not the bacteria itself), and it's the same with making cheese/beer/yoghurt/etc. (humans like waste)
3. Dead bacteria? Possibly. Could adding proprietary screenwash kill a whole colony of bacterias cultured over years by a previous owner?
4. Cheap screenwash? Was the brand I used last just a coloured water... humn... I'll post the brand-name later (it was a cheap impulse buy).
So before you all switch to using just-any-proprietary screenwash to save yourselves from an untimely painful death, is there something you can do to flush out the bacteria and stop them dying and turning to gunk?
Maybe bleach will incinerate their bacteria bodies... I don't know... it's interesting though