Stain on M4 hood?

[nepats81]

Hey everyone . I have a BSM 2018 M4 that I bought this summer. It's been a mild winter so far here in NH, and I haven't driven too much in the last month. I just noticed today some staining on the hood of the car on both sides. It doesn't look like normal winter grime though... can any of you tell what it is? Maybe I just need to get it washed ASAP?

[Wmf80]

Hmm I have something similar on my ppf at the same spot. Just one side tho(driver). I have a MW and it doesn’t have the blue color like urs. A while back on a rainy day I remember like a cola liquid/ maybe oil, wiped it off and saw the stain so unsure if that was the reason. Unable to get it off. Starting to worry if it’s actually the hood under the ppf.

[BzsBimmer]

Probably should have posted in the detailing section but whatever you do... start with least aggressive method to clean first.

[rockstar b]

Looks like clear starting to let go

[nepats81]

Originally Posted by rockstar b

Looks like clear starting to let go

What to do? Car is still under warranty

[Groganrocket]

Looks like sunblock, i rubbed against my car when I applied sunblock in the summer and it looks like that.

[nepats81]

Another pic under bright lights in the evening. Is this something that will come out? I'm worried as it seems to be part of the paint

[ChuMpion3]

Agreed with the sunblock comment until your last post. Get that looked at by a pro.

[Wmf80]

Wow that’s crazy bad. Maybe not the same as mine after all. Mine is only visible close close up

[RoundelM3]

Try polishing it after cleaning/claying. If that doesn't work, a pro detailer can probably do a wet-sand with 2K grit and then polish it out.

[IVM3]

If it's under warranty, I would take it to the dealer before doing anything. The clear coat may be failing for some reason. A detailer can probably make it look better but it won't fix the problem and you'll just end up with less clear coat when they wet sand and buff it.

[icegrill]

I'm guessing salt residue!? Needs to be polished out hopefully.

[ChuMpion3]

Originally Posted by IVM3

If it's under warranty, I would take it to the dealer before doing anything. The clear coat may be failing for some reason. A detailer can probably make it look better but it won't fix the problem and you'll just end up with less clear coat when they wet sand and buff it.

Agree with this. Have a pro look at it but don’t act. That looks like a paint issue.

[jfritz27]

Originally Posted by icegrill

I'm guessing salt residue!? Needs to be polished out hopefully.

This could be it.... I got similar looking stuff from parking in a parking garage, in a space above which the concrete was chronically being leached with water and it would drip down. Though typically you will see splatter tracing the route the water runs down and off the car, which I don't really see there. It can be hard to remove.

May wish to try Carpro Spotless on it:
https://www.carpro-us.com/paint-deco...BoC760QAvD_BwE