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Interesting coincidence. I recommended the 3M to another fellow restorer about a week ago who mentioned a blade with an etch. Here is his response:
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And the pictures
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https://sharprazorpalace.com/workshop/105743-what-you-working-1927.html#post1932806

...the other thing to note is that it's like Bryl Cream: a little dab'll do ya. I probably could have gotten better results but since I was clocking myself I stuck my finger in and got a dollup which...

It goes a long way though. I have a tub I use a LOT and it has lasted for over 2 years and is still 1/3 full.

So to make the point here is a grubby one I pulled at random to give a demonstration.
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I took some electrical tape and taped half the blade.
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Then spent 5 minutes, and I timed it...

Do yourself and that etching a favor and get a tub of 3M Marine Metal Polish and Restorer. It will work miracles and NOT remove etchings. Polish BY HAND with a rag and some of that and you won't...