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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Cosmetic Maintenance: Wash, Wax, Detailing, Repairs > Rain = filthy rear end
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      12-01-2012, 03:10 AM   #1
c.cash
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Rain = filthy rear end

Drove through a couple of mild rainstorms now. Black Saphire. First time, I pull it into the garage... Looks so so - hood ok, side panels pretty dirty... Walked around back and HOLY SH*T!!!

Looked like someone dumped a bucket of muddy water on the trunk! Something about the aerodynamics that pushes all the dirt to the back of the car. Never saw anything like it.

No question here, just couldn't believe it.
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      12-03-2012, 08:11 PM   #2
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I have white and had the car for 2 days... It's terrible due to the rain but i did know what i was getting into
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      12-05-2012, 10:27 AM   #3
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Same. Cleaned the car on Monday and we've had rain since (of course). Holy hell the rear is no longer EBII... it's just dirt colored!
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      12-05-2012, 11:09 AM   #4
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Quote:
Originally Posted by MNBart View Post
I have white and had the car for 2 days... It's terrible due to the rain but i did know what i was getting into
same exact thought first white car...

also seems like more black stuff around rear end from exhaust
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      12-05-2012, 11:34 AM   #5
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Totally agree with you guys! I noticed the same...
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      12-05-2012, 04:25 PM   #6
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And the door sills -- after driving in rain... I've never seen anything like it with other cars.

Lucky for me it doesn't rain much here, but it's been off and on for about two weeks. I think I've washed my car like 5 times

Ask me in another 2 years, but for now, I don't mind.
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      12-05-2012, 05:04 PM   #7
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beer quest

Drove out to the Westvleteren abbey/brewery...in the countryside on farm roads on a wet day...filthy. She cleaned up nice though, until it rained the next day.
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      12-05-2012, 09:26 PM   #8
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^ Is that one of the new BMW Individual colors?? Mojave-Estoril gradient fade?
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      12-06-2012, 12:17 AM   #9
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Exactly! Had to wait an extra month for it
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      12-06-2012, 06:05 AM   #10
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Quote:
Originally Posted by MNBart View Post
I have white and had the car for 2 days... It's terrible due to the rain but i did know what i was getting into
Exactly same situation.... have an AW M-sport and after 1 brief drizzle, the rear bumper just under the boot looks really really dirty
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      12-06-2012, 10:11 AM   #11
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Quote:
Originally Posted by c.cash View Post
And the door sills -- after driving in rain... I've never seen anything like it with other cars.

Lucky for me it doesn't rain much here, but it's been off and on for about two weeks. I think I've washed my car like 5 times

Ask me in another 2 years, but for now, I don't mind.
Haha yea i noticed the door sills as well. It's my first white car as I had a blue gti before this but it's definitely going to take some getting used to. Lots of car washes for me!

I seems like the wheels protrude out more where the rear bumper starts to come in toward the center of the car which really gets those lower corners dirty.
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      12-09-2012, 12:59 PM   #12
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Even if it doesn't rain the dirt seems to pile up really quickly.

On another note; what is the best way to clean up your chrome tail pipe tips? The carbon builds up way to fast. Is there a way to help reduce the amount that builds up?
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      12-10-2012, 02:52 PM   #13
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biggsman, i had the same issue with my GTI. guys at the local car wash had some good stuff they used. I'll ask next time im there
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      12-11-2012, 10:00 AM   #14
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Too much turbulence in the rear. Was actually thinking bout this a few days ago; a better, or rather, a REAL diffuser would make a huge difference by creating better airflow that would improve the pressure difference between the dead space behind the rear end and the air flowing towards the rear. M Performance spoiler sufficient?


Mud flaps would also help, maybe someone could design sporty ones
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      12-13-2012, 12:28 AM   #15
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it happens to all cars.

definitely get mud flaps as suggested above.

makes cleaning the rear bumper easier
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      12-14-2012, 02:03 AM   #16
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Quote:
Originally Posted by tdotman View Post
it happens to all cars.

definitely get mud flaps as suggested above.

makes cleaning the rear bumper easier
I've owned 10 cars and none of them have ever looked like this in the trunkal area after rain. It's not a big deal... It forces me to clean her up, where with other cars I might wait longer.

And no way am I putting mud flaps on this car. That's crazy talk.
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      12-14-2012, 07:20 AM   #17
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Quote:
Originally Posted by c.cash View Post
I've owned 10 cars and none of them have ever looked like this in the trunkal area after rain. It's not a big deal... It forces me to clean her up, where with other cars I might wait longer.

And no way am I putting mud flaps on this car. That's crazy talk.
It donīt get crazier than that
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      12-16-2012, 11:35 PM   #18
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Quote:
Originally Posted by Biggsman
Even if it doesn't rain the dirt seems to pile up really quickly.

On another note; what is the best way to clean up your chrome tail pipe tips? The carbon builds up way to fast. Is there a way to help reduce the amount that builds up?
Cleaning, 000 or 0000 steel wool-it's like magic
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      01-09-2013, 12:23 PM   #19
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Mine is EBII as well and I was astounded that my car looked like the above picture after just a brief run in the rain. I knew that a medium blue car would show the dirt but man - this is brutal. And then we have the dusty M sport brakes and the 19 inch wheels to clean!

I have a brand new hobby - driveway detailer! Every couple of days. My neighbours think I am nuts. But then they drive Chryslers! Oh what a snobby remark!
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      01-09-2013, 01:59 PM   #20
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the new aerodynamics are crazy...all that wind/dirt/grime all end up at the rear.

That's airflow for ya!
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      01-14-2013, 01:56 PM   #21
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Yea tell me about it. Spent 2 hours ex detailing the car and cleaned the windows, everything. Next day it rained. When I got home it did 't look too bad, just typical but holy cramp the back! I have a mineral white 328, looks like it turned to that nasty brown yet have...
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