Lookie! real-life cosmic rust!
http://en.wikipedia.org/wiki/Iron_bacteria
Found in water that is oxygenated (the bacteria is iron based, and has to have oxygen to consume the iron (ferrite) in the water. It also eats phosphorus. XDXDXD
I'd love to see how the 2007 movie bots would react to this knowledge, expecially if they've just been to a car wash. Even though most places like that would probably use chemicals that kill the bacteria, I don't think the Autobots would know that. Unless theey ask someone. I wonder just how freaked out they would be.
Anyone want to adopt this bunny? I can't write TFTM2007 to save my life. Please, someone WRITE THIS! I can just see sideswipe or someone freaking out/thinking it's cosmic rust.
Plus, cosmic rust has been in about every series BUT the movies. It would make a nice touch. :-)