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Posted
On 9/24/2024 at 4:30 PM, N201MKTurbo said:

I finally fixed all the oil leaks in my 56 Cessna. So I'm cleaning the belly. The previous (RIP) owner's son told me it always leaked oil. So there is decades of gunk. I have made it from the tail to the wheels so far. Shooting for the firewall today. I'm using mineral spirits, then Goof Off with a scrub brush, then soap and water. Disgusting job. My wife says I should hire someone to do it. Where do you find this person?

I find using a airpressure hose to spray on mineral spirits does a decent job of blasting away grime in the engine bay especially hard to reach areas. Maybe would work on the belly too?

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Posted
9 hours ago, Will.iam said:

I find using a airpressure hose to spray on mineral spirits does a decent job of blasting away grime in the engine bay especially hard to reach areas. Maybe would work on the belly too?

that’s what I did first. It got all the liquid oil off. The baked on crud is taking a lot of elbow grease.

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Posted

I tried the tub of towels last night. I always thought the nose wheel well was painted black but noooo there is shinny aluminum metal there once you get through the black crud layer. Then i started thinking maybe that is mother nature’s corrosion protection, will spray corrosion-x in there for good measure once i clean it all out. 

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Posted
1 hour ago, Will.iam said:

I tried the tub of towels last night. I always thought the nose wheel well was painted black but noooo there is shinny aluminum metal there once you get through the black crud layer. Then i started thinking maybe that is mother nature’s corrosion protection, will spray corrosion-x in there for good measure once i clean it all out. 

Humm, there is usually paint there, maybe the wipes worked too good....

Posted
3 minutes ago, Shadrach said:

No paint in the nose well well of my 67 Exec.

Here is the "h" you lost.

In My 67 F the plastic wasn't painted, and the metal was bare. My J is painted, but it was repainted before I got it. They may have painted it.

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Posted

So, there are lots of cleaning products on the market that can be used on airplanes. Looking at the SDS may give a clue to what is corrosive, but maybe not. I think it's best to use products that have passed Boeing D6-17487 which comprises four tests: Sandwich corrosion, acrylic crazing, paint softening and hydrogen embrittlement. For the sandwich corrosion test, a piece of filter paper is saturated with the cleaner and sandwiched between two sheet aluminum test pieces and placed in a humidity chamber. 

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Posted
2 hours ago, PT20J said:

So, there are lots of cleaning products on the market that can be used on airplanes. Looking at the SDS may give a clue to what is corrosive, but maybe not. I think it's best to use products that have passed Boeing D6-17487 which comprises four tests: Sandwich corrosion, acrylic crazing, paint softening and hydrogen embrittlement. For the sandwich corrosion test, a piece of filter paper is saturated with the cleaner and sandwiched between two sheet aluminum test pieces and placed in a humidity chamber. 

@PT20J

ALCLAD, or unpassivated?

Posted

Tub o' towels works great for me in order to remove oil and grime. It does absolutely nothing for exhaust gray streaks. What do you guys use for that?

  • 2 months later...
Posted

My wife was just cleaning the oven. She was using this stuff called Scrub Daddy Power Paste. She was telling me how great it works. I read the ingredients and didn't find anything that would hurt the aluminum or the paint. It has a clay based abrasive, which is probably OK on urethane paint. 

I did a wing repair a couple of years ago and the paint was a little speckled. I color sanded the top of the wing 3 days after spraying. it polished up just fine. I left the bottom for another day. Six months later I went to color sand the bottom and 2500 sandpaper would hardly touch it. So I don't think a clay based abrasive would do any damage.

I ended up using Comet cleanser on the bottom of the Cessna. it didn't hurt the paint. I think the clay in this stuff is less aggressive than the super fine limestone powder in the cleanser.

https://scrubdaddy.com/product/powerpaste

 

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