The hazards of using degreaser in engine bay

Nachtycoupe

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I wanted to post this in the e9 section as well as because it doesn't matter what car you drive, this could happen to you as well. If I can save one member from having this happen to them it will put a smile on my face :lol:. And that is, be careful when spraying degreaser in your engine bay. I have to say, the products out there work amazing, however sometimes they work a little too good. Case in point, a product called Super Clean, many of you are probably familiar with it, comes in a purple bottle, it is a degreaser. Well, here is what happened, see pic. That VIN plate was in decent shape before spraying the engine bay; now all you can basically make out is the indent in the stamp of the VIN. Before, all the black paint was still on there, faded yes, but very distinguishable. I was....how do you say it?......Pissed? When I started washing everything down I looked at the plate and it was silver, not black...all the paint came off. But the stickers were fine, no problem. So, point is, make sure when you are spraying down your motor and engine bay with degreaser to mask the plate or any other older paint to metal that was not primered… I think that was the problem. It just washed right off and no way of replacing that since it is the VIN. Anything else I could probably repaint or get a new sticker, not sure what to do other than leave it as is and live with it. See stickers, they is fine, it was already faded like that, all other stickers look fine. Maybe this is common knowledge but it was a first for me and I've sprayed down engine bays before and never recall having this problem.
 

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Yeah, can happen.

I used a cleaner once that dissolved the paint on the rims and the tainted the chrome on the chrome rim around the front grill :( Nothing else. And it was a professional cleaner.

But I guess you never really know what will dissolve what so the takeaway is to use as mild a solvent as possible? Or dilute the one you plan to use and test.
 
I used a citrus based degreaser, and it got the crap out without bleaching my stickers. I was worried about it being too effective, so I used as little as possible.
 
Seems to have worked well on the A/C hoses!

Don't get any such degreasers on PAINT (engine block excepted)!! I believe they all have disclaimers about getting the studd on anything but the engine.

Best degreaser I've used is the stuff you use to prep a body before shooting your top coats. Doesn't harm any type of modern auto paints but cuts thru grease like magic. Down side is VOC's and cost ($20/gal). stoddard solvent (old mineral spirits) is also very safe for cured paints.
 
That is why I like WD40, it doesn't hurt paint. It is good fir sticker residue and dried car wax.
 
I had a worse situation with super clean. I had a fresh jug in the back of my DD. I went to get it out 2 days later and the seal had leaked eating the dye of my leather seat. Super clean did step up and pay for the repair/redye. I think the answer is that super clean from the gallon jug has to be diluted
 
That is why I like WD40, it doesn't hurt paint. It is good fir sticker residue and dried car wax.

BTW, the painting prep degreasers I recommended, while safe for your paint, WILL dissolve the adhesive on stickers, so I would ONLY use it on the engine itself and painted surfaces withOUT stickers. I used it to clean the tar based undercoating off my E-type bonnet and after a quick 2nd wipe it was clean enough to paint.

Sorry if I screwed up anyone with this advice, but if so now you can get a set of new shiny stickers from Carl.

The one thing I do not like about WD40 is the silicon.

John
 
from the WD 40 website

While the ingredients in WD-40® Multi-Use Product are secret, we can tell you what it does NOT contain. WD-40® Multi-Use Product does not contain silicone, kerosene, water, graphite, or chlorofluorocarbons (CFCs).
 
from the WD 40 website

While the ingredients in WD-40® Multi-Use Product are secret, we can tell you what it does NOT contain. WD-40® Multi-Use Product does not contain silicone, kerosene, water, graphite, or chlorofluorocarbons (CFCs).

Thanks Stan
I'd heard that it did have the big S and would badly contaminate surfaces and interfere with later painting. I wonder if a gal of WD40 is cheaper. Anyway so use WD15 when you want to leave an oily film, and I'm gonna stick with mineral spirits (cheap), and paint prep degreasers (powerful with no residue).
 
Watch out for Simple Green and aluminum. There is a version of it that is tolerable on AL but I forget the name.
 
Watch out for Simple Green and aluminum. There is a version of it that is tolerable on AL but I forget the name.

WD-40 does leave a residue on paint. Definitely don't use it if you plan on painting something. It's almost like a poor man's car wax. Glad it doesn't contain silicone. Reading that comment had me alarmed.

I use simple green on everything. It is good on aluminum wheels that have been painted. I suppose that I've never used it on raw aluminum. Most aluminum parts are either anodized, so I'm not sure what the scenarios might be. BTW, I use simple green to clean the leather seats in my Subaru. I wouldn't do it on new Coupe leather, but it doesn't seem to have any ill effects on the Scooby so far.

I'm like the guy from "My big fat greek wedding" with windex, except simple green is my poison.
 
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