Cleaning rust on cast iron?

HuskerMan · 12-10-2012, 01:17 PM

What is the best way to clean rusty cast iron? Bought some pots that need cleaning.

aawa · 12-10-2012, 01:19 PM

Hit the rusted area's with fine grit sandpaper till the rust is off. Then re-season it accordingly.

deguerre · 12-10-2012, 01:21 PM

Um...what if the entire thing is covered in rust? Does anyone still use Naval Jelly?

el_matt · 12-10-2012, 01:27 PM

I've used a wire wheel on a drill or angle grinder. I've tried using Naval Jelly in the past, on other projects, I didn't have any luck with it.

Matt

chicagokp · 12-10-2012, 01:31 PM

I use fine grit sand paper or a wire wheel. Or a 50/50 mix of vinegar and water, but only for a short time, like an hour or two.

Taking off the carbon and sludge I use a 5 gallon bucket of water with 12 oz of lye.

RW · 12-10-2012, 01:33 PM

I read somewhere that Coke does a great job.

Bluesman · 12-10-2012, 01:41 PM

While we're on the subject. I have some Lodge pans and I wash them in just hot water after cooking. When I wipe them out I get a black residue on the paper towel. Did I not season correctly or what?

rg02 · 12-10-2012, 02:47 PM

50/50 water vinegar for an hour or two till the rust is gone. be sure to wash with dish soap and hot water after. then toss it in the oven at 200 to fully dry then start your seasoning process.

as for lodge CI bluesman, if you have a lot of black gunky residue after a cook soemtimes you need more then just hot water. take a lightly oiled paper towel and some kosher salt and lightly scrub your greasy areas (not too hard). then coat rinse, dry on the burner, and coat with a thin layer of oil.

Smoking Westy · 12-10-2012, 03:05 PM

I would strip the seasoning completely, deal with the rust and then re-season. To strip it, give it a soak in a lye bath. I bought one of those plastic tubs with a lid on it and picked up some lye from the hardware store. Give it a soak in there to dissolve all the gunk and seasoning on it. I've soaked pans as little as a day or two and as long as 3 weeks. It makes cleanup a breeze.

From there you can rinse it off and hit the rust with a mixture of vinegar/water and steel wool. Once it is all cleaned up you can re-season and start cooking.

MisterChrister · 12-10-2012, 03:17 PM

http://www.wag-society.org/Electrolysis/lye.php

Basically what a few above have said. I've restored countless old pieces ranging from no-name oldies to Griswold/Wagner/Piqua etc. You can do a lye bath (be CAREFUL of your skin/eyes) to remove everything except the rust first (as long as needed, you can't hurt it in the lye bath), then rinse well and do a a 50/50 water/vinegar to get the rust off. You're ok to go up to 12-18 hours if need be on the vinegar solution, just SOFT wire brush it occasionally as it goes. Then rinse VERY well to neutralize the vinegar, warm in the oven to dry, and season as you like. I prefer lard since I use mine all of the time.

Offthehook · 12-10-2012, 03:20 PM

No one has said this yet I dont think but I heard a good way is let them soak in oven cleaner over night in a plastic bag. I had a Griswold that had so much caked on stuff, I used a razor blade to scrape it off.

mbshop · 12-10-2012, 03:51 PM

on pagw 2 of this discussion you will see a nice simple setup to clean any ci product.
http://tvwbb.com/showthread.php?3769...and-cook/page2

Beef · 12-10-2012, 04:58 PM

I am lazy. I use electrolysis with a automotive battery charger, and a solution of washing soda and water.
Attach black lead to your submerged cast iron, and the red lead to a sumberged piece of scrap steel. DO NOT let those two touch.
Plug in the charger and let it 'cook' for a day or so and check the progress.

Works for me

Google the washing soda electrolysis approach for the recipe.

chicagokp · 12-10-2012, 05:17 PM

Quote:

Originally Posted by Bluesman

While we're on the subject. I have some Lodge pans and I wash them in just hot water after cooking. When I wipe them out I get a black residue on the paper towel. Did I not season correctly or what?

That's pretty normal. Once you pan is really seasoned in hard you may not notice that anymore. But what you describe is fine.

seattlepitboss · 12-10-2012, 05:38 PM

Before you resort to any heavy methods, start with what you can do easily. Warm the pans up with some oil in them and wipe them out. Often on pans this will get nearly all the rust off. What more there is I'd take off when warm, with edible mineral oil, and 0000 steel wool and elbow grease.

Sure, you can sandblast, or do electrolytic derusting, or otherwise strip it to completely bare chemically clean iron. Which will nearly instantly rust again. Don't use anything with phosphoric acid in it (naval jelly) because of possible poisoning.

I bought a Griswold lamb cake mold off ebay once that was rusty when I got it, just like your pans. A little heat, a little oil, and the rust wiped right off. That lamb cake mold looks like new today.

seattlepitboss

12-10-2012, 01:17 PM	#1
HuskerMan Full Fledged Farker Join Date: 08-05-12 Location: Wahoo,Ne	Cleaning rust on cast iron? What is the best way to clean rusty cast iron? Bought some pots that need cleaning.

12-10-2012, 01:19 PM	#2
aawa Babbling Farker Join Date: 07-03-12 Location: Virginia Beach, VA	Hit the rusted area's with fine grit sandpaper till the rust is off. Then re-season it accordingly. __________________ ~Ren~ Fat Kids Club Founding Member

12-10-2012, 01:21 PM	#3
deguerre somebody shut me the fark up. Join Date: 07-15-09 Location: Memphis, TN...Formerly of Decatur, AL	Um...what if the entire thing is covered in rust? Does anyone still use Naval Jelly? __________________ Guerry [FONT=Book Antiqua]Pit Beeatch for Team Munchkin[/FONT] [FONT=Book Antiqua][B]Avatar by Northwest BBQ [/B][/FONT]"...In nature, there are predators. I believe the common denominator of the universe is not harmony, but chaos, hostility and murder..." Werner Herzog

12-10-2012, 01:31 PM	#5
chicagokp Babbling Farker Join Date: 02-17-11 Location: Chicago north 'burbs IL	I use fine grit sand paper or a wire wheel. Or a 50/50 mix of vinegar and water, but only for a short time, like an hour or two. Taking off the carbon and sludge I use a 5 gallon bucket of water with 12 oz of lye. __________________ Shirley Fabrication 24x60 staightback cabinet + warmer Battle Box Midi UDS Weber Performer 22.5 Weber OTG WGA Charcoal Weber Genesis

12-10-2012, 01:33 PM	#6
RW Full Fledged Farker Join Date: 02-13-12 Location: Texas Hill Country	I read somewhere that Coke does a great job. __________________ Weber Performer / 18.5 WSM / mini WSM / Primo XL / #14 Old Smokey / Weber Jumbo Joe

12-10-2012, 01:27 PM	#4
el_matt Babbling Farker Join Date: 12-08-09 Location: Turlock, California	I've used a wire wheel on a drill or angle grinder. I've tried using Naval Jelly in the past, on other projects, I didn't have any luck with it. Matt

12-10-2012, 01:41 PM	#7
Bluesman Babbling Farker Join Date: 01-01-10 Location: Planet Krypton Name/Nickname : Jon	While we're on the subject. I have some Lodge pans and I wash them in just hot water after cooking. When I wipe them out I get a black residue on the paper towel. Did I not season correctly or what? __________________ 2010 22.5 WSM Weber Q200 1983 WGA 2010 Brick Red Touch n' Go Performer Kitchen stove

12-10-2012, 02:47 PM	#8
rg02 Full Fledged Farker Join Date: 08-08-12 Location: Castle Rock, CO	50/50 water vinegar for an hour or two till the rust is gone. be sure to wash with dish soap and hot water after. then toss it in the oven at 200 to fully dry then start your seasoning process. as for lodge CI bluesman, if you have a lot of black gunky residue after a cook soemtimes you need more then just hot water. take a lightly oiled paper towel and some kosher salt and lightly scrub your greasy areas (not too hard). then coat rinse, dry on the burner, and coat with a thin layer of oil. __________________ --Modified ECB---Mini WSM---22.5" Weber blue OTG---'69 18.5" Weber redhead----Mav ET-732

12-10-2012, 03:05 PM	#9
Smoking Westy is one Smokin' Farker Join Date: 06-10-12 Location: Bloomington, IL	I would strip the seasoning completely, deal with the rust and then re-season. To strip it, give it a soak in a lye bath. I bought one of those plastic tubs with a lid on it and picked up some lye from the hardware store. Give it a soak in there to dissolve all the gunk and seasoning on it. I've soaked pans as little as a day or two and as long as 3 weeks. It makes cleanup a breeze. From there you can rinse it off and hit the rust with a mixture of vinegar/water and steel wool. Once it is all cleaned up you can re-season and start cooking. __________________ WSM 22.5", One-Touch 22.5", Redhead 18.5" Smoke Joe Silver, Q200, "Mr. T"

12-10-2012, 03:17 PM	#10
MisterChrister Quintessential Chatty Farker Join Date: 04-28-12 Location: Wis-con-sin	http://www.wag-society.org/Electrolysis/lye.php Basically what a few above have said. I've restored countless old pieces ranging from no-name oldies to Griswold/Wagner/Piqua etc. You can do a lye bath (be CAREFUL of your skin/eyes) to remove everything except the rust first (as long as needed, you can't hurt it in the lye bath), then rinse well and do a a 50/50 water/vinegar to get the rust off. You're ok to go up to 12-18 hours if need be on the vinegar solution, just SOFT wire brush it occasionally as it goes. Then rinse VERY well to neutralize the vinegar, warm in the oven to dry, and season as you like. I prefer lard since I use mine all of the time. __________________ Kettleheads Anonymous Charter Member

12-10-2012, 03:20 PM	#11
Offthehook is One Chatty Farker Join Date: 12-04-12 Location: Los Angeles, CA	No one has said this yet I dont think but I heard a good way is let them soak in oven cleaner over night in a plastic bag. I had a Griswold that had so much caked on stuff, I used a razor blade to scrape it off.

12-10-2012, 03:51 PM	#12
mbshop Babbling Farker Join Date: 06-24-07 Location: visalia, ca	on pagw 2 of this discussion you will see a nice simple setup to clean any ci product. http://tvwbb.com/showthread.php?3769...and-cook/page2 __________________ george spam, can't live without it

12-10-2012, 04:58 PM	#13
Beef Full Fledged Farker Join Date: 09-03-11 Location: Cedarburg, wi	I am lazy. I use electrolysis with a automotive battery charger, and a solution of washing soda and water. Attach black lead to your submerged cast iron, and the red lead to a sumberged piece of scrap steel. DO NOT let those two touch. Plug in the charger and let it 'cook' for a day or so and check the progress. Works for me Google the washing soda electrolysis approach for the recipe.

12-10-2012, 05:38 PM	#15
seattlepitboss is one Smokin' Farker Join Date: 02-05-09 Location: Seattle, WA	Before you resort to any heavy methods, start with what you can do easily. Warm the pans up with some oil in them and wipe them out. Often on pans this will get nearly all the rust off. What more there is I'd take off when warm, with edible mineral oil, and 0000 steel wool and elbow grease. Sure, you can sandblast, or do electrolytic derusting, or otherwise strip it to completely bare chemically clean iron. Which will nearly instantly rust again. Don't use anything with phosphoric acid in it (naval jelly) because of possible poisoning. I bought a Griswold lamb cake mold off ebay once that was rusty when I got it, just like your pans. A little heat, a little oil, and the rust wiped right off. That lamb cake mold looks like new today. seattlepitboss