Well, I tried it yesterday and, no, it didn't happen instantly. It took a google search to get it right.
I don't have any "before" pictures, sorry, didn't think of it.
But here it what my little heart looked like when it came out of the pickle:
And here is what it looks like after I scrubbed it lightly with steel wool:
And I didn't use my steel pliers, either. I used a piece of annealed steel wire from the hardware store and left it lying on top of my heart. And everything soaked in the pickle for quite a while, I didn't time it, sorry.
Here's where I found all the info that explained it in detail: