Draining the tank doesn’t have to be done the hard way. Just buy a cheap siphon pump at the auto parts store and get as much E85 out as you can. Then fill it up with regular fuel. If you can find pure gasoline (without 10% Ethanol), that would be better for filling up. If you can’t find pure gasoline, E10 should be fine. If you can, drain the E85 into a metal gas gan and use it up slowly by mixing it with gasoline.
E85 should not hurt the engine. The danger is that E85 can disintegrate exposed rubber and plastic parts that are normally exposed to fuel in a non-flex-fuel vehicle. I disagree with both points of view. I think you should either siphon it out or burn it up ASAP.