I didn't expect this reaction, but good job getting your panties in a wad over a nickel that is worth a nickel. I was merely sharing my experience. I didn't recommend anything.
I'm with you Bugo..........you did what you did and made a cheap coin a little more presentable than it was to begin with. As us Brits say in times of crisis...... pip pip, chin up old boy!
What I've learned in five+ years on CoinTalk is if anyone dare mentions "cleaning", the purists will come down on you like a ton of bricks. I wouldn't worry about it too much bugo... and never take anything on this (or any other) forum personally.
Only time will tell if it does or doesn't harm coins. Let us put them under a magnifier a year or three down the road. Some chemical interactions tend to take years to run their course. Simple water rinsing sometimes doesn't halt some interactions. Likewise, getting away with it on the coins specified doesn't mean it is safe for all metals.
That is the thing...there are some topics that just get people going. I see nothing wrong with "playing" with pocket change as it will be worth the same when you are done. If you are having fun experimenting...then go for it. Just don't allow yourself to become convinced that these methods are "working" and can be applied to coins with collector value. As long as you are just experimenting with face value pocket change...I say "have fun." From what I have read...I think you understand that bugo.
You can see the label: "Contains 2-butoxyethanol and sodium hydroxide". It is NOT an acid, it is a strong base probably with a pH greater than 12-13. 2-butoxyethanol is nasty and produced cancer in lab animals. Some countries do not even allow its use. This product may work great on grills, but using it on coins is very, very bad. The pH is just WAY too high.
I don't know much about 2-butoxyethanol but if it has shown the ability to cause cancer in lab animals...I don't know if I want it on my grill either.
No fear, it's fairly volatile and it will certainly be completely vaporized when the grill is heated. What you don't want is to get in on your skin or breath in the vapors.
We call it "caustic soda" and you don't want it on any part of your body. It will eat you up, quick. Bugo, it's your coins, do what ya wanna do, I can't tell ya who to sock it to....
I'm just playing with you, Looking up clean in the search bar shows so many heated arguments about the topic. As long as it is pocket change, you are perfectly fine.