Cosmoline Removal Help!
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Old 05-16-2014, 11:25 AM   #1
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Default Cosmoline Removal Help!

I recently purchased a Mosin Nagant 91/30 and its covered in cosmoline. What is the best way to remove the cosmoline?? Thanks for any advise!!

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Old 05-16-2014, 12:58 PM   #2
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I've found that Simple Green/Mean Green and warm (almost hot) water works very well. Get a pan of warm water and put a good amount of Simple Green in, and mix, then take a tooth brush and get to scrubbing. I put all the small parts (screws, bolt parts, magazine block, ect) in with the simple green water while I scrub the rifle itself, then I go through one by one and scrub all the parts. After you have them all clean, get an old towel and make sure there isn't any water on any of the parts. For the bore I just push a few dry patches, then I use patches with a solvent (Hoppes, CLP, ect). Then apply a thin coat of an oil of your choice (I like RemOil), and there she is! And for the stock, I used paper towels to scrub the cosmo out of the stock, but if you use that method, whenever you get to shooting, cosmo will being to seep out of the hand guard and thin parts of the stock. One way to prevent this is wrapping the stock in paper towels and putting the wrapped stock in a black garbage bag, and putting it out in the sun/in your car on a hot day/somewhere hot, and the cosmo will bake out of the stock. Or you can just lay the stock on a towel in the sun and periodically go and wipe down the cosmo that has seeped out.
Alternate cleaners: these may be a little easier and less labor intensive. You can use brake cleaner, carburetor cleaner, oven cleaner, mineral spirits, ect. to spray on the cosmolined parts and just simply wipe/scrub away. I've used carburetor cleaner to get in the hard to reach spots, it works pretty good. You can soak the parts in mineral spirits and the cosmo will dissolve away and all you need to do is wipe/scrub away residual cosmo, and you can get a long section of PVC pipe (I think 3" diameter) and put a cap on one end and seal it, and fill it almost to the top with mineral spirits and put the entire barrel and receiver assembly (take off the bolt, and magazine block) and let it soak in there overnight, that'll work as well.
I hope this helped and gave you several options, if you have any more questions feel free to ask!

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Old 05-16-2014, 01:07 PM   #3
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I got a bunch of AK mags and they came covered in cosmoline. If you have a parts washer available clean it there . I did not but I found that straight acetone ate the cosmoline right off .

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Old 05-16-2014, 02:24 PM   #4
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1) take down the rifle
http://youtu.be/PvpLgjXN-cI

2) wipe down parts with towel dipped in hot water. repeat. and again. and again.......

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Old 05-16-2014, 03:01 PM   #5
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Some good info above- and there are dozens of ways. Cosmoline is applied hot, and it thickens up when cooled. Baking wooden parts wrapped in brown paper grocery bags INSIDE of a black plastic garbage bag (bake in the sun) works very well.

If you use a chemical solvent, READ the label. Much of that stuff is either flammable, or will eat the paint off your car and cause you to have funny looking kids. Use outdoors, with a lot of ventilation- and why did my gloves just dissolve?

My personal favorite- GOOP orange hand cleaner. Get it from the dollar store. Squirt on toothbrush (someone else's toothbrush) scrub, rinse under HOT water. Does NOT stink up house, does a good job, will not make you run down the street while on fire.

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Old 05-19-2014, 05:25 AM   #6
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Mineral spirits destroy the stuff, also an old pot of boiling water breaks it up pretty good too

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Old 05-19-2014, 05:02 PM   #7
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Create a oven from a galvanized trash can. Works very well

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Old 05-19-2014, 05:27 PM   #8
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Wd40 on the metal parts that you can't soak. Soak the bolt and small parts in mineral spirits. "orange clean" or "simple green" on the wood works good. There are a ton of ways to do it and most work great.

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Old 05-19-2014, 05:33 PM   #9
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Quote:
Originally Posted by purehavoc View Post
I got a bunch of AK mags and they came covered in cosmoline. If you have a parts washer available clean it there . I did not but I found that straight acetone ate the cosmoline right off .
Acetone will work but that is one of the most dangerous chemicals mentioned so far. If you do use acetone DO NOT pile the rags and leave them ANYWHERE. Don't even pile them up and toss them on the driveway because they WILL combust. Acetone reacts with other ammonia based cleaners sometimes too. We just had an acetone fueled fire at my work recently. Someone was cleaning with acetone, tossed the rags on the back of the truck, and literally 5 minutes later they were on fire. Nearly burned down a $300,000 spray foam insulation truck. Be careful and read all labels no matter what you're using. You can usually get the MSDS sheets from the manufacturer website too.
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Old 05-21-2014, 04:31 AM   #10
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Brake Cleaner is cheap. Just do it outdoors. It might be alright on the wood but I don't think so. Mineral spirits. I would have never though of using soap and water on grease like cosmoline. Several suggested it so it must work.

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