...that you're not supposed to get on your guitar because it can ruin finish/wood.
Any corrosive chemical?
Someone explained it as kind of an STD for guitars because it can transfer between them through playing or repair. It's in some polishing fluids that some people use on their guitars not knowing about the one chemical in there. I'm also curious about what exactly it does.
I think it's only on nitro finishes, it's also on rubber guitar stands too so you have to put something between the stand and the guitar so the nitro doesnt mess up.
Yeah, my local guitar shop do it with a polishin cloth, but they do it on EVERY guitar which is a bit over the top.
Silicone can creep under the finish of your guitar and make ugly blemishes that are a pain in the butthole to get rid of.
paint thinner? idk, anything thats acidic or corrosive, sometimes even sweat can do something depending on what kindof coat you have. chlorohydric acid is not your friend.
dare say c4 is up there....
Acetone, I believe.
polishes with silcone in is the worst culprit. The guitar stand/hanger thing is true, only on nitro cellulose finishes mostly, some others too. I always put a pair of socks over stands/hangars to protect the guitars.