I've used Simple Green in the past, with no problems. Yes, as pointed out above, there were issues with soaking components (chains, I think) for days in Simple Green. I forgot the failure mechanism, but something like stress corrosion cracking because of the alkalinity or acidity of the solution reacting over a long time. For some reason, I don't like the scent of Simple Green. It's not offensive but to me has a sweet smell that I don't like. In the last few years, I've been using a citrus based, water soluble degreaser. I buy it by the gallon (at typical hardware or home improvement stores) and use to clean the stove top, bicycle and general degreasing.