It depends on you, I suppose.
There are schools of thought both ways. Some like a shiny blade. I myself, think the tarnish (or more likely, patina) protects a good carbon blade from rusting easily. I doubt you will ruin the blade if you clean it. However, if it has sentimental value, you may not want to do much to it. A "used" knife from a relative sometimes has a value beyond money.
I remember a work buddy years ago, he had just bought a Sharpfinger, and had used while we were fishing. It developed a "stain", and we were bound and determined to clean it up.
As I said, this was many years ago, when I liked knives, but didn't know squat about carbon blades. (I am older now, but still don't know squat, BTW)
If this is a show piece, you may consider polishing the blade, but if it is a user, a good patina may be the right choice.
But like I said, it is up to you...
Glenn