Should I clean or leave as found 1940 K98k

That is the worst advice you could have given. You might as well have said "use scoitch brite on the tough stuff". DO NOT EVER USE STEEL WOOL! It will hurt the finish. Bronze or brass wool is the only thing you should use.
BS I've been doing this for 50+ years and there are NO ILL EFFECTS. Four O steel with the gun dripping in oil when you use it does not hurt a damn thing!
 
Are there grades to bronze or brass wool similar to 0000 steel wool? What would be the grade to use on appropriate metal finishes? Thanks
in bronze wool, I’ve only found 0 thru 000, never 0000, or 00000. It may be made, but I’d think it would fall apart under use, as 000 sometimes does when scrubbing something hard. I wear 7 mil gloves when scrubbing with either steel or bronze wools to keep some of the fines out of my skin. My local Ace hardware carries bronze wool in 0-000, but the clerk wasn’t too sure about it. I haven’t seen brass wool at any brick & mortar store, I think too soft for most applications. Small brass bristle brushes are plentifully available from china at the cheap tool store, as are the same style in stainless.
 
BS I've been doing this for 50+ years and there are NO ILL EFFECTS. Four O steel with the gun dripping in oil when you use it does not hurt a damn thing!
I'll definitely stop short of calling bullsh*t, however I'd really like to see some before and afters or even more ideally a short video showing it. I've used all grades of abrasives, steel wool and Scotchbrites in Green (mostly) but also grey and red. I'm fairly familiar with how they abrade surfaces and I would really need to SEE this not ruining the finish to believe it.

Thinking about it more, IF it's truly slathered in oil AND you can go REALLY lightly I suppose it would be possible to knock down the light surface rust without ruining the finish/ Not a gamble I'd wish to take on a collectible rifle, but I do admit it's probably possible to do this.
 
One more thing to consider and I'd love to hear some discussion. There's a huge difference between 'blued' finishes. Some are very deep and very strong and others are nearly opaque. Surely they would neither rust or respond to its removal the same way.
 
I wouldn’t recommend using steel wool for a variety of reasons.. removing finish being one.. however another is also when using steel wool you are leaving microscopic steel particles behind… which also will then rust.. which just compounds the problem.

Use brass or bronze wool..
 
Are there grades to bronze or brass wool similar to 0000 steel wool? What would be the grade to use on appropriate metal finishes? Thanks

I never use fine steel wool on a firearm. Yes, I know its softer than steel, etc. On bronze wool it comes in fine, medium, and course, generally. That's what I've got. I kind of like the course because it doesn't hold bits of rust. Be aware that if the wool picks up flecks of the rust removed it becomes a steel abrasive. Ballistol wipe, bronze wool / bronze brush, wipe, repeat. If it starts to shine you've done too much. I remove active rust. I do not remove rust staining or browning. It's a firearm, a piece of equipment that was maintained. I like patina, I don't like active rust. Same with the bore. the stock if dirty and grimy needs a light wipe or nothing at all. The trick to conservation is to do nothing that cannot be undone. I don't remove old dried grease. I don't remove rust browning. I don't clean metal until it shines unless it's the bore. Nice honest rifle. If you are to err, err on the side of doing nothing because in a climate, uv, humidity, and insect controlled environment it will look like that long after we're all 10-7.
 
I'll definitely stop short of calling bullsh*t, however I'd really like to see some before and afters or even more ideally a short video showing it. I've used all grades of abrasives, steel wool and Scotchbrites in Green (mostly) but also grey and red. I'm fairly familiar with how they abrade surfaces and I would really need to SEE this not ruining the finish to believe it.

Thinking about it more, IF it's truly slathered in oil AND you can go REALLY lightly I suppose it would be possible to knock down the light surface rust without ruining the finish/ Not a gamble I'd wish to take on a collectible rifle, but I do admit it's probably possible to do this.
I avoid scotch Brite like the plague.
 
I am a bayonet collector mainly. The blue varies between bayonets. It can vary between the blade, pommel, flash guard, cross guard and scabbard on a matching set. Be it heavy, light or somewhere in between. Sometimes the blue is replaced in spots or more with patina. There is no way in hell I would ever use steel wool in any grade on any of my bayonets, even if that bayonet was swimming in a tub of oil.
I have a bayonet that the scabbard is mostly covered with patina. It looks like the slightly brown blue that is on a lot of bayonets. I was using a cloth and oil to wipe it down when I first got the set. There was a little surface rust in one area on the scabbard, so I rubbed a little harder in that one spot. Boy was I surprised when the "blue" suddenly thinned out and shiny metal began to show through. I put on my eye glasses and upon a closer inspection there was a lot of patina present on that scabbard and I can only imagine what would of happened if I had used steel wool. And since then, I never attempt to clean a new bayonet without putting my glasses on first.
 
I’d send it to Novak or at least watch his preservation and restoration videos. I haven’t found anyone better to watch and explain it in layman terms . Cover the manufactures procedures, depo procedures etc.
it’s worth a look before you touch it
 
It’s not spacecraft design and operation. Common sense and don’t over abrade, don’t over clean. All the good info you need is in this thread. Go slow. Don’t make it shine white metal.
 
My 2 cents is as follows:

Stock - Leave it alone. It looks good, and the proof marks are pretty clear all things considered.

Rifle - Ballistol on gun cleaning wipes. Rinse and repeat. If needed, bronze wool and Ballistol will take away more stubborn surface rust.

When taking it apart, go nice, slow, and gentle. Do not force anything. When unscrewing the trigger guard, be gentle as the screws can be soft and easy to warp/strip. Lots of great disassembly/assembly videos on YouTube to guide you.

Congrats and enjoy it!
 
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