 What removes oil and black undercoating but not paint? |
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| mskala |
 Jun 11 2026, 04:05 PM
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#1
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R  Group: Members Posts: 1,951 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None 
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My car used to leak oil from lots of places. After rebuild, now everything's pretty
good. But, particularly from under the oil tank area, oil has got on a large area under the floor and longs. I found accidentally that the CRC Electronic Cleaner doesn't seem to remove paint, but it is so weak that the black undercoat (wurth?) turns into a huge amount of black goo that hasn't really come off the car. I want to save any paint and the white-ish undercoat. Any products that will do this? I assume my paint is the old lacquer type paint. Thanks Mark S. |
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| 930cabman |
Jun 11 2026, 05:03 PM
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#2
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Advanced Member Group: Members Posts: 4,701 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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I would start with Dawn and work up from there.
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| mark04usa |
Jun 11 2026, 05:08 PM
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#3
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'70 1.7 Tangerine Group: Members Posts: 364 Joined: 14-September 09 From: Austin TX Member No.: 10,805 Region Association: Southwest Region
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Next, I would try naptha it should not affect paint...try on test area first. Naptha (lighter fluid) is highly flammable and you would need ventilation.
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| Cairo94507 |
Jun 11 2026, 05:15 PM
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#4
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Michael Group: Members Posts: 10,669 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California
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I use BrakeKleen (the one not sold in CA) and it cleans stuff off easily without hurting or dulling the paint. I never would have guessed it but my buddy Greg has been using that on his cars for years w/no issues on any painted surfaces. As always, if you try this, try it on a spot that you can risk it on.
When we installed my rear glass, we used urethane - what a mess that was because we cut the tip of the tube off so the hole was too big. (IMG:style_emoticons/default/wacko.gif) But it all cleaned up nicely using BrakeKleen on microfiber towels. (IMG:style_emoticons/default/smile.gif) |
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| JeffBowlsby |
Jun 11 2026, 05:16 PM
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#5
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,268 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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If its oil-based, paint thinner (mineral spirits) should work and not affect cured paint.
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| 930cabman |
Jun 11 2026, 06:01 PM
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#6
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Advanced Member Group: Members Posts: 4,701 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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Simple Green
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| mskala |
Jun 11 2026, 07:17 PM
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#7
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R Group: Members Posts: 1,951 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None
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Thanks I will try a few of these tomorrow
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| brant |
Jun 11 2026, 07:30 PM
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#8
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914 Wizard Group: Members Posts: 12,210 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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20 years ago
One of the oil removing citrus cleaners worked for me I’d use starting fluid before brake cleaner. Brake cleaner can effect some paints. Hopefully not the old stuff on a 914 |
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| SKL1 |
Jun 11 2026, 09:16 PM
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#9
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Senior Member Group: Members Posts: 1,803 Joined: 19-February 11 From: north Scottsdale Member No.: 12,732 Region Association: Upper MidWest
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Used dry ice cleaning to remove 55 year old Ziebart on my early '71 - left nice but slightly dull original silver paint.
Not cheap (and messy even when you're not doing it yourself!) but very efficient. |
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| targa72e |
Jun 11 2026, 09:39 PM
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#10
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Member Group: Members Posts: 303 Joined: 11-September 16 From: colorado Member No.: 20,392 Region Association: None
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You can see some of the things I used in this thread and how the worked.
http://www.914world.com/bbs2/index.php?sho...l=the+white+car I general citrus for grease and dirt Brake clean, red can. Green can will strip many paints. Dawn industrial cleaner (grease) available on amazon. I did not have a lot of undercoating to remove. I have soaked undercoated parts in Red brake clean with good success. john |
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