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Old Sep 20, 2009, 09:31 PM
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u2builder's Avatar
USA, NH, Alstead
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How do I remove baked on castor oil

Is there a household chemical (solvent) ,and automotice chemical, or a chemical sold by RC vendors, that can be used to remove the brownish castor oil residue that can bake onto the outside of engines and especially mufflers? Thanks.
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Old Sep 20, 2009, 09:38 PM
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Originally Posted by u2builder
Is there a household chemical (solvent) ,and automotice chemical, or a chemical sold by RC vendors, that can be used to remove the brownish castor oil residue that can bake onto the outside of engines and especially mufflers? Thanks.
Antifreeze in a crock pot on low.
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Old Sep 20, 2009, 10:18 PM
Airplane Gearhead
Central N.Y.
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Automotive carb cleaner works well (Gummout or equiv.)
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Old Sep 20, 2009, 11:12 PM
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I've used to very good effect - Boil engine with Bio washing powder/liquid and leave overnight to soak
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Old Sep 21, 2009, 08:15 AM
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Is there no "brush on" solvent. I have tried carb cleaner and it sort of works but very slowly and tediously. I did not want to remove the engines, but rather clean them once in a while.

Baked castor oil might make a good protective metal coating, huh. I wish I could get paint to stick like that.
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Old Sep 21, 2009, 09:53 AM
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Everett Wa.
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Sunbeam use to sell a product that worked great. I don't know what it actually was. Does anyone know what this household cleaning product was. Was it safe?

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Old Sep 21, 2009, 10:10 AM
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Sunbeam use to sell a product that worked great. I don't know what it actually was. Does anyone know what this household cleaning product was. Was it safe?
I'd love to know what it was. Eazy Off oven cleaner might work if the engine was hot. Maybe tonite I try brushing some on and heating up the engine with my heat gun.

I sort of remember buying some chemical from a Hobby Shop in my first short lived foray into this hobby many years ago, but maybe it has been banned.
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Old Sep 21, 2009, 10:41 AM
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No eazy off will mar etch the aluminum.
What is wrong with burned on oil?
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Old Sep 21, 2009, 10:48 AM
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What is wrong with burned on oil?
At some point it will interfere with cooling.
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Old Sep 21, 2009, 11:00 AM
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What is wrong with burned on oil?
Nothing of consequence. I am not particularly a neat freak, and don't do a great job wiping down my planes after flying, but every once and a while I do a cleanup and if I could get that brown stuff off the motor easily I would.

It does seem to be a good indicator of how hot the motor gets. It doesn't turn brown unless it reaches a certain temperature. It mostly shows up on parts of the muffler and on certain sides of the cylinder head. I rarely see it elsewhere which suggests the rest of the motor does not get hot enough to bake it on.
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Old Sep 21, 2009, 12:35 PM
Airplane Gearhead
Central N.Y.
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There was this stuff called "Demon Clean" that you brushed on and rinsed off...don't know if it's still available though?

The Gummout "jet spray" (or cheaper equivalent ) will remove varnish (after all, that's what it's designed for) quite effectively, especially if you help it a little by scrubbing w/ an old tooth brush.
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Old Sep 21, 2009, 12:41 PM
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I think you are right "Demon Clean". It worked a lot better than "Gummout" Gummout works great on petroleum deposits that gum onto the carb. They really aren't like oxidized and vulcanized castor
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Old Sep 21, 2009, 12:50 PM
Airplane Gearhead
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Gummout evaporates very quickly...and you'll use quite a bit of it (maybe half a can) cleaning a really grungy engine...but with a tooth brush you can get most of the baked of stuff out from between the fins.
The main drawback is that it's a fairly nasty chemical, and you really should wear gloves and eye protection, and of course, use it outdoors...but I've had great luck with it. Works well at loosening up gummy/sticky bearings too.

The Demon Clean is/was a thicker consistency, and clings to the engine/doesn't evaporate as quickly. The thing is though, you still need to rinse it off...but with what? I used Gummout (I noticed that it worked purty good all by itself)
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Old Sep 21, 2009, 01:21 PM
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I found the Demon Clean and ordered a can. It is expensive, but it will be interesting to give it a try. I'll report back. Thanks for the tip.


http://www.bj-model-engines.com/Demo..._11-11-05.html
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Old Sep 21, 2009, 02:15 PM
Airplane Gearhead
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I see that the formula has been changed...please give us a report after you get 'er cleaned up.
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