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Carbon deposits are black. And you're right Ethanol has more solvent than 'Pure' Gasoline. E85 more so. I can't understand the rest of what you said, except to contradict you since Ethanol is almost identical to Methanol. Methanol has a slower burn speed and more oxygen so it has lower energy density than even Ethanol. But put into an engine and the difference is minor compared to the difference between Gasoline and Ethanol. They're both alcohols and even their octane is very similar.
I have a suspicion that it might be low grade gasoline that is the culprit for the deposits because I checked my fuel filter after E10 became more common and I didn't have any sludge in my fuel filter vs my Dad's buick which had a little bit of black sludge in the fuel filter.
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-Allch Chcar
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