2005 Lotus Elise
Wow, totally helpful article. I have the same issue with the same green/black sludge. Yuk. This helped and I plan to keep a very dilute mixture of windshield washer fluid in the tank to stop the crud in the future. I normally run just water but maybe I will deviate this time. Probably good for everyone to take not of to prevent needing to do this job in the future! Thanks!