Cleaning your engine with Ethanol?

[imzjustplayin]

I read that ethanol will clean up your engine even if it's not intended for it. I heard of a few people using E85 in their cars and was wondering if others have tried using it in their cars for at least the purpose of cleaning up the engine. I heard that the exhaust will be dark on an older car because of the built up carbon deposits being dislodged. My idea was to remove the O2 sensors and then run with the ethanol in order to prevent the O2 sensors from being contaminated.