Don't soak the engine in simple green
The long answer is on the simple green web site. The short answer is don't soak metal parts in it for long periods of time.
Wash the engine with simple green, rinse well with HOT water, Rinse again with HOT water, then run the engine until it reaches operating temperature. This will dry the engine.
Bilge Bully, is great, but it is emulsifier that requires soaking for a period of time. Not easy to accomplish on the engine! They cleaners are opposites, Simple green should not be left to soak on anything, and bilge bully must be left to soak.
You can also get aluminum safe Simple Green called extreme Simple Green which is made for aircraft aluminum cleaning. It does a good job, but not as good as regular simple green on boat engines.
From the Simple green Folks.
Emphasis mine
"Dear Lennard,
My name is Denise Dochnahl and I work for Simple Green. I’m writing because I recently read a posting about someone leaving his bike chain
soaking in undiluted Simple Green for five months, and then having the chain disintegrate on them. I also read that something similar happened to someone else, after having left his chain in undiluted Simple Green for just two weeks.
I have received comments from other bicycle enthusiasts that have tried a new Simple Green product on their bikes and bike parts, and have had great success with it. The product is a little bit different – it was designed specifically for the aircraft industry, and has heightened non-corrosive properties. It has passed Pratt-Whitney specs and Boeing specs, as well as other testing protocols. This is very likely a much better product to use for the applications I read about on VeloNews.
While Original Simple Green is an excellent all-purpose cleaner/degreaser, it was
not designed for long-term storage of bike chains or other parts. While we stand by the efficacy of the product, and believe it to be an excellent cleaner for bikes and bike parts, we feel we must stress the importance of using the product according to the label instructions.
Under no circumstances should anything be stored in any formula of Simple Green.
The new product, called ExtremeSimple Green Aircraft & Precision Cleaner, has heightened non-corrosive qualities, making it perhaps more suitable for high-tech bike alloys, painted surfaces, rubber and plastic parts. To date we have only promoted this product in the aviation industry. If it turns out to be better for bicycles and bike parts as well, then we’d certainly like to let people know about that.
Denise Dochnahl
Marketing Specialist
Simple Green"
I can't see your photos, because the link does not link to them directly, but I have cleaned a number of really bad specimens this way without issue.
Guy