Join Date: Nov 2014
Location: Plymouth, UK
Vehicle: Had a 2013 SLK 250 Cdi in F/O red, now have 'Woody' a 2017 A*** TT Coupe in tango red (what else?)
Other Toys: Mini Cooper in Red
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Judge, I've no idea how it got there, it wasn't ever visible from the engine bay when I was topping the bottle up. I've only ever filled it with water straight from the tap (it's pretty good where I live) and about 20% screen wash.
The stuff seemed organic in its nature, but some of it coated the inside of the bottle so tenaciously that I couldn't have cleaned it properly without removing it from the car. If it was organic I didn't want to leave any remnants of it in there to start multiplying again.
I did a bit of googling and some people suggest that it may be promoted by mixing different brands of screen wash. I don't know if that's a likely explanation, I've only ever used one brand, but it's almost certainly different from what the original owner used, so it could be a possibility.