Bad earth, i had a few the same all i did was remove the earth strap from the battery and body then where it joins the body make it shiney again lol, this worked for my short to ground codes but not saying it'll work for you but worth a try 
Washer fluid is blue and the rear washer is fine. Plus the tubing for it is on the other side of the car to the exhaust.
Do the colours match anything in the bay? I'm struggling to think what could get down there. Nothing other than brake fluid, but then you'd likely feel that in the pedal...
Hay mate what size adapters are you running ?
Thanks
I don't think so. Someone on vagingit thought it might be unburnt fuel.
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Just done a deal on another set of wheels.
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9 inches of shininess!