Underbody wash safe for newer GM trucks?

M

marshallz3m

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So I'm looking at the frame of my 2015 GMC Sierra, and realized that it has a thick, wax-like coating applied at the factory. It is somewhat soft, thick, and a little tacky. I am hesitant to use anything that might degrade or damage the coating since it is there to prevent corrosion of the frame.

Has anyone dealt with this stuff before? I want to clean the layer of dirt and road grime off of the underside, but I'm not sure how.

Thanks!
M.




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Just give it a good power wash and leave it be. You don't want to strip off the protection underneath just to have a super clean undercarriage which is unreasonable considering I assume this is a dd.
 
WillSports3 said:
Just give it a good power wash and leave it be. You don't want to strip off the protection underneath just to have a super clean undercarriage which is unreasonable considering I assume this is a dd.
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Exactly.

And, I'd be more worried about how to clean those "black carpeted" wheel wells on the GM trucks. Lol
 
Frame grease is what i call it, nasty stuff for sure in hot weather, your best bet is a garden hose.
Under no curcumstance agitate with a brush, don't ask me how i know.
 
I am not a fan of the carpeted wheel wells. I have dealt with them a few times with family/friends vehicles, also the rear wells on my car have it. The best advice I can give is to clean the best you can, I use a mild APC and a well brush. Let them dry, then apply 303 Fabric Guard. It isn't perfect but in my opinion it helps quite a bit. When I do my weekly wash, I just hit them with my PW, and they look pretty good. I do this routine every couple months or so. The picture below was taken a couple months ago for another reason. But the little bit of the well you can see is pretty clean, and it was awhile since being treated.
 
Hammer77 said:
I am not a fan of the carpeted wheel wells. I have dealt with them a few times with family/friends vehicles, also the rear wells on my car have it. The best advice I can give is to clean the best you can, I use a mild APC and a well brush. Let them dry, then apply 303 Fabric Guard. It isn't perfect but in my opinion it helps quite a bit. When I do my weekly wash, I just hit them with my PW, and they look pretty good. I do this routine every couple months or so. The picture below was taken a couple months ago for another reason. But the little bit of the well you can see is pretty clean, and it was awhile since being treated.
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Thank you for the advice, I never thought of applying fabric gaurd to it. I would love to ask the creator of fabric wheel wells what the heck he, or she, was thinking!

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On the carpeted wheel wells on cars I'm cleaning on a regular basis I just use high pressure water. I may try the 303. It's been my experience that brushes just fray the fibers and they start holding more dirt.
 
DETAILROOKIE said:
Thank you for the advice, I never thought of applying fabric gaurd to it. I would love to ask the creator of fabric wheel wells what the heck he, or she, was thinking!
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Yea they are a pain but are used for additional sound deadening.
 
GMTech said:
Yea they are a pain but are used for additional sound deadening.
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If someone needs that much sound deadening in a truck, they should look into a car or teleportation.

I have a buddy who was on the fence about getting a Chevy or a Ram. He chose Chevy. After getting his wheel wells dirty a few times and complaining how awful they were to clean, he traded the Chevy in at my Chrysler dealer for a Ram. Truck had 1,100 miles on it.

And that's just one guy that I know of. GM really F'd up installing this on a pickup. Jmo
 
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