It's a spirited debate, and I also don't like any rudeness. But, I have learned things, despite my engineering knowledge, sometimes remembering things from college metallurgy that have fallen through the cracks in the mental floorboards, as it were.

For one thing, don't use Simple Green (I tried once, worked poorly, and thankfully no damage to chain), but more importantly, someone advised against citric acid, which I think may be present in citrus cleaners, and I thought that was a widely used, more environmental alternative to petroleum-based solvents? Haven't heard a reply on that question, but I hope to. A quick search brings up Finish Line Citrus Bike Degreaser, been around since 1988, my guess is does not damage the chain. Wiki says citric acid can remove rust, and act as a chelating (cleaning?) agent. It's been 40 years since I balanced a chemical equation, so I've not a clue regarding interaction with steel or aluminum.