Trunk lid/rear of car

curveball99 · 03-23-2011, 01:49 PM

The rear of my car has a number of small black, grey and caramel-colored spots that do not come off during a normal wash. However, after using a bug/tar remover on a small test area, the spots came off pretty easily. But I'm hesitant to use a cleaner that's potentially too abrasive over a wider surface area. Any thoughts/advice??

I have the Akrapovic Evolution exhaust w/ 100 sports cats, but I'm not sure to what extent it's contributing to the discoloration.

The photo was taken after a wash.

Crazy Bimmer · 03-23-2011, 01:51 PM

Use a clay bar.

Grail05 · 03-23-2011, 04:58 PM

wash the car

wipe it dry

get the quick detailer spray

while its wet

clay it...

and wipe...

then

wax the car and for final use carnauba wax to protect the seal

e90m3_6MT · 03-23-2011, 08:11 PM

Use IronX from Cquartz, It works better than the clay bar for the rust spots and save time and paint swirls

PhYrE · 03-23-2011, 08:54 PM

Got that too. Comes off with rubbing but would love to know what it is. It's ON the paint. Looks lik tiny rust spots

rzm3 · 03-23-2011, 10:08 PM

clay clay clay... make sure you use enough lube for it though.

CalgaryX3 · 03-23-2011, 10:15 PM

Common issue for vehicles driven in snowy climates. The surface rust (which can appear even on plastic panels such as bumpers) is the oxidation of residual metallic compounds found in road salt and other snow melting agents deposited on roadways.

Nothing a little elbow grease, read clay bar or wax won't fix.

A

raiste · 03-24-2011, 11:52 AM

If you have train tracks nearby, the rust spots can also be from rail dust.

.

Joonsup · 03-24-2011, 04:41 PM

medium grade claybar should do the trick as others suggested.

Definitive · 03-24-2011, 04:43 PM

I have these as well, and even after a full detail with clay, they are still there. Mine even look like they are under the paint... I have stock exhaust with cutouts. So I dont think its the exhaust...

But I would also like to know how to get rid of them.
D

e90m3_6MT · 03-24-2011, 07:40 PM

Like I was saying, with IronX (previously iron cut), it just dissolves the rusts spots then use a microfiber to agitate, then rinse and wash.

It will remove small rusts spots that you're not even seeing. it will remove them much more in depth than a clay bar ever will.

Templar · 03-25-2011, 09:22 AM

Had the same thing, clay bar took them right off with minimal effort.

03-23-2011, 01:49 PM	#1
curveball99 Private First Class 29 Rep 164 Posts Drives: 2011 E92 M3 Join Date: Oct 2009 Location: Planet Earthenware iTrader: (2)	Trunk lid/rear of car - lots of spots (w/ PIC) The rear of my car has a number of small black, grey and caramel-colored spots that do not come off during a normal wash. However, after using a bug/tar remover on a small test area, the spots came off pretty easily. But I'm hesitant to use a cleaner that's potentially too abrasive over a wider surface area. Any thoughts/advice?? I have the Akrapovic Evolution exhaust w/ 100 sports cats, but I'm not sure to what extent it's contributing to the discoloration. The photo was taken after a wash. Attached Images
	Appreciate 0 Tweet Quote

03-23-2011, 01:51 PM	#2
Crazy Bimmer The Jesal 391 Rep 5,859 Posts Drives: E90 M3 Join Date: Nov 2005 Location: Chicago IL iTrader: (20) Garage List 2009 BMW M3 [0.00]	Use a clay bar. __________________ 2009 E90 M3 - SOLD
	Appreciate 0 Quote

03-23-2011, 04:58 PM	#3
Grail05 Putcha ang ganda... 281 Rep 5,441 Posts Drives: 17 F82 M4 Join Date: Feb 2010 Location: Los Angeles, Brea CA. iTrader: (10)	wash the car wipe it dry get the quick detailer spray while its wet clay it... and wipe... then wax the car and for final use carnauba wax to protect the seal __________________
	Appreciate 0 Quote

03-23-2011, 08:11 PM	#4
e90m3_6MT First Lieutenant 40 Rep 318 Posts Drives: 2016 GT3 RS Join Date: Apr 2010 Location: Montréal iTrader: (0)	Use IronX from Cquartz, It works better than the clay bar for the rust spots and save time and paint swirls __________________
	Appreciate 0 Quote

03-23-2011, 08:54 PM	#5
PhYrE New Member 9 Rep 25 Posts Drives: BMW Join Date: Jan 2010 Location: Toronto iTrader: (0)	Got that too. Comes off with rubbing but would love to know what it is. It's ON the paint. Looks lik tiny rust spots __________________ E92 2008 M3 Coupe Eibach Pro-Kit Springs Active Autowerke short-shifter Carbon-Fibre everything
	Appreciate 0 Quote

03-23-2011, 10:08 PM	#6
rzm3 Moderator 673 Rep 4,737 Posts Drives: E92 M3 Join Date: Aug 2007 Location: USA iTrader: (18)	clay clay clay... make sure you use enough lube for it though.
	Appreciate 0 Quote

03-23-2011, 10:15 PM	#7
CalgaryX3 Captain 169 Rep 659 Posts Drives: 2007 E90 335i / 2011 E90 M3 Join Date: Jun 2007 Location: Calgary, Alberta Canada iTrader: (0)	Common issue for vehicles driven in snowy climates. The surface rust (which can appear even on plastic panels such as bumpers) is the oxidation of residual metallic compounds found in road salt and other snow melting agents deposited on roadways. Nothing a little elbow grease, read clay bar or wax won't fix. A
	Appreciate 0 Quote

03-24-2011, 11:52 AM	#8
raiste Time is the fire in which we burn. 4 Rep 176 Posts Drives: 2015 SSII M3 Join Date: May 2010 Location: SC iTrader: (2)	If you have train tracks nearby, the rust spots can also be from rail dust. .
	Appreciate 0 Quote

03-24-2011, 04:41 PM	#9
Joonsup Lieutenant General 322 Rep 17,316 Posts Drives: E92 M3, E30 325i Join Date: Sep 2007 Location: Bay Area iTrader: (8) Garage List 2008 BMW M3 [9.50]	medium grade claybar should do the trick as others suggested.
	Appreciate 0 Quote

03-24-2011, 04:43 PM	#10
Definitive definitivecars.com 354 Rep 3,833 Posts Drives: Elsa - 2015 F80 M3 - YMB/SS Join Date: Aug 2006 Location: So Cal iTrader: (3) Garage List 2011 E90 M3 [6.66] 2009 (Lease up Sept ... [0.00] 2007 (Lease up 6/19 ... [0.00] 2007 (Lease up Octo ... [0.00]	I have these as well, and even after a full detail with clay, they are still there. Mine even look like they are under the paint... I have stock exhaust with cutouts. So I dont think its the exhaust... But I would also like to know how to get rid of them. D
	Appreciate 0 Quote

03-24-2011, 07:40 PM	#11
e90m3_6MT First Lieutenant 40 Rep 318 Posts Drives: 2016 GT3 RS Join Date: Apr 2010 Location: Montréal iTrader: (0)	Like I was saying, with IronX (previously iron cut), it just dissolves the rusts spots then use a microfiber to agitate, then rinse and wash. It will remove small rusts spots that you're not even seeing. it will remove them much more in depth than a clay bar ever will. __________________ Last edited by e90m3_6MT; 03-25-2011 at 10:10 AM..
	Appreciate 0 Quote

03-25-2011, 09:22 AM	#12
Templar Lieutenant Colonel 268 Rep 1,883 Posts Drives: 2011 E92 M3 Join Date: Feb 2009 Location: One of the coasts... iTrader: (1) Garage List 2011 BMW M3 [10.00]	Had the same thing, clay bar took them right off with minimal effort. __________________ '11 BMW E92 ///M3 - ZCP and DCT '15 Ford F-250 - Lariat, 6.7 Powerstroke Turbo-diesel
	Appreciate 0 Quote