What's your secret sauce for disolving cosmoline?

Are you having problems with a rifle or handgun? Having problems with a magazine? This is the place to post for help or to help others. If you fixed that nagging problem with your AR-15, this is the place to post how you did it.
Post Reply
User avatar
Suck My Glock
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 8978
Joined: May 25th, 2018, 3:01 pm
Reputation: 8
Location: Peoria

What's your secret sauce for disolving cosmoline?

#1

Post by Suck My Glock »

Recently acquired some magazines and other stuff jam packed with cosmoline. In the past, I've had good luck with just using regular gasoline and a stiff-bristle brush. The oil would disolve easily enough, although the paraffin would require some elbow grease to get rid of. But I've always been successful doing this in the past.

(For those unfamiliar, cosmoline is a mix of gun oil or motor oil and wax, creating goopy gelatinous spooge that is slathered on guns and gun stuff put in deep storage as an anti-corrosion preservative. Typically applied at high temp in a more liquid state, which then solidifies.)

But I guess the Brits used an entirely different wax recipe, because while I was able to get them free of oily brown sticky, and scrubbed and scrubbed, I was still left with a resilient whitish layer of residue everywhere. Further scrubbing with gasoline failed to remove it.

I'm tempted to next try acetone, but I'm slightly worried that might attack other finishes. So before I go any further, I wonder if the brain trust here has any experience with using solvents other than gasoline to dissolve away cosmoline and its notorious waxy remnants. What have you successfully used in the past?


User avatar
hrob
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 74
Joined: November 30th, 2022, 7:46 pm
Reputation: -1
Location: Prescott

Re: What's your secret sauce for disolving cosmoline?

#2

Post by hrob »

Try mineral spirits.
User avatar
Lobo2087
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 793
Joined: January 14th, 2019, 8:27 pm
Reputation: 8
Location: Surprise

Re: What's your secret sauce for disolving cosmoline?

#3

Post by Lobo2087 »

Gasoline and steam
User avatar
NM303
New to ArizonaShooting.org
New to ArizonaShooting.org
Posts: 15
Joined: February 28th, 2021, 12:12 pm
Reputation: 0
Location: NW WA

Re: What's your secret sauce for disolving cosmoline?

#4

Post by NM303 »

This is all you need (and you won't blow yourself up). I usually add 25% hot water to slightly dilute it. Works great on blued steel, but don't use on painted (or other coated) items. Purple Power
User avatar
Lobo2087
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 793
Joined: January 14th, 2019, 8:27 pm
Reputation: 8
Location: Surprise

Re: What's your secret sauce for disolving cosmoline?

#5

Post by Lobo2087 »

I had bad try with that but I may not have diluted well enough. It left a whitish coating that was near as bad as the cosmoline to remove for me.
User avatar
kenpoprofessor
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 2028
Joined: July 22nd, 2018, 4:10 am
Reputation: 3
Location: Phoenix

Re: What's your secret sauce for disolving cosmoline?

#6

Post by kenpoprofessor »

I use a steamer and a heat gun. Steamers work especially well for the wood stock. Heat guns work well for bolts and carrier groups. I've put some stock in black plastic bags out in the sun, heats up well during the summer.

Have a great, gun carryin', Kenpo day

Clyde
User avatar
PK90
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 74
Joined: May 17th, 2018, 10:24 am
Reputation: 1
Location: Goodyear
Contact:

Re: What's your secret sauce for disolving cosmoline?

#7

Post by PK90 »

Oven
User avatar
SupportTheSecond
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 485
Joined: August 1st, 2021, 11:11 am
Reputation: 0
Location: Oro Valley

Re: What's your secret sauce for disolving cosmoline?

#8

Post by SupportTheSecond »

With our weather you can also let it sit outside to help leach out the cosmoline.
QuietM4
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 2142
Joined: May 15th, 2018, 8:36 pm
Reputation: 12
Location: Tempe

Re: What's your secret sauce for disolving cosmoline?

#9

Post by QuietM4 »

PK90 wrote: September 21st, 2023, 4:19 amOven
NOT the oven inside your home.
User avatar
mtptwo
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 577
Joined: October 9th, 2018, 1:38 pm
Reputation: 0
Location: West Mesa

Re: What's your secret sauce for disolving cosmoline?

#10

Post by mtptwo »

Boiling water also works well, but you are left with a tub of hot water with a layer of cosmoline floating on top.
User avatar
omegaman
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 333
Joined: May 14th, 2018, 3:51 pm
Reputation: 3

Re: What's your secret sauce for disolving cosmoline?

#11

Post by omegaman »

Black plastic bags, wrap gun in paper towels and place in bags then place in the sun. Drink 6 beers and it should be almost done.
User avatar
Kingjoey
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 928
Joined: July 3rd, 2019, 8:18 pm
Reputation: 5
Location: Mesa

Re: What's your secret sauce for disolving cosmoline?

#12

Post by Kingjoey »

Citrus spray cleaner for the wood, and a big pot of boiling water with a little Simple Green added for cleaning the metal parts
User avatar
Tenring
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 2483
Joined: June 2nd, 2018, 10:13 am
Reputation: 7
Location: Cave Creek

Re: What's your secret sauce for disolving cosmoline?

#13

Post by Tenring »

User avatar
bill460
ArizonaShooting.org Member
ArizonaShooting.org Member
Posts: 79
Joined: March 23rd, 2020, 11:27 pm
Reputation: 0
Location: Lake Havasu City

Re: What's your secret sauce for disolving cosmoline?

#14

Post by bill460 »

Grease, (which is basically what Cosmoline is), cuts the best with a light oil based solvent. Clean Kerosene is just about perfect. It's cheap, will not harm wood or plastic, and cut's through the driest, thickest Cosmoline.

If the smell bothers you, plain WD-40 also works very well, and it's available in gallon sized cans are places like Home Depot and Lowe's.
Post Reply