Personally I have used e-85 in my street and race cars for over 5 years, and never have seen or experienced any deposits on the injectors or inside the engines?
At the SEMA show over the years, I personally have talked with engineers and research employees from Joe Gibbs, Stabil and others about e-85 storage and affects on the injectors, as well as the other fuel system components.
I also was able to obtain some research documents from them as well, and have been very impressed with their e-85 additives.
The one chemical that is used in their additives is used to "blend" or assimilate the alcohol and gasoline. This chemical is used by the refineries, but they use a small amount, so the shelf life is rather short.
My local customers and myself that have used either additive have never experienced the "goo" issue.
Since my e-85 turbo cars are not driven often, I have a yearly routine to pump out all the e-85 and put a gallon or so of gasoline in the tank. I run the engine at a high idle until most of the gas is consumed, and then add back the e-85.
Maybe I am somewhat paranoid about old, bad gasoline in many cars over the years, this process make me feel better, but I never have seen goo from e-85 in my cars or local ones!