Iron Mike Golf said:
You might want to keep it away from aluminum alloy frames.
sfbiker said:
Careful, gents. Been told that Simple Green is corrosive. Don't let it sit on your guns too long!
Both IMG and sfbiker are correct. Simple Green is an alkaline (high pH) cleaner with surfactants and wetting agents. Alkaline cleaners are hydroxide-based and WILL corrode aluminum, zinc, magnesium, and their alloys. If sufficiently high in pH, alkaline cleaners will actually DISSOLVE aluminum and other light metals and their alloys.
Aluminum is typically cleaned with acid-based cleaners. Commercial cleaner products for aluminum automotive wheels are acidic. That said, I do NOT recommend their use for aluminum alloyed firearm components. Firearms best respond to solvent cleaning with the exception of black power weapons, or firearms in which corrosive ammunition has been fired, and then hot soapy water (e.g., Dawn in hot water) is the way to go.
Plenty of members may chime in and say, "I've used Simple Green for years and it never bothered any of my guns." That is a function of exposure dwell time, cleaner product dilution, and the protection afforded some aluminum parts by anodizing, which is resistant to alkaline cleaning agents. In other words, YMMV. The safe bet is to NOT use alkaline cleaners on expensive objects made from aluminum and its alloys.
When I read threads like this I am always reminded of a "tight" local chap who considered the storeroom at work an extension of his garage. He advocated the use of a red high-temp oven grease to lubricate and protect his firearms. He had a S&W 65LS, to the gripstraps of which he applied this grease. A few years later, he removed the grips and discovered significant pitting -- the grease had additives that actually promoted pit corrosion in unpassivated martensitic stainless steel:
Once I explained the corrosion mechanism of the additive's effect on the stainless, and that stainless steel is NOT rustproof, he was so sick with the thought that he himself was responsible for the unintended and undesired consequences of his action in using a product for something other than its intended use, that he quickly sold the 65LS (to me) and found another.
Nasty things, unintended consequences are . . . people pay big $$$$ for firearms but end up stepping over dollars to save dimes.
Noah