This may well have been discussed in the past. I know there is an issue with alloy wheel damage however my wheels seem to be impregnated with road grime. No matter how hard you scrub the stubborn black marks will not come off. All 4 wheels are affected and have been for a while.

It look like the alloys were never laquered (if thats what they do) and therefore grime gets into the surface.

This common or just mine ? MY10 TDV6 HSE, Alaska White, Ebony with Contrast, Park Heat, Paddle Shift, Privacy, Heated Steering Wheel, Extended & Premium Leather,

MY07 TDV6 HSE, Zermatt Silver, Gone

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1964 Austin Healey 3000

2007 LR Defender

2011 VW Tiguan R Line

All the same - best advice/solution = Wonder wheels = Beststuff on the market. [ takes a while though ] 
" WITH MORE EXTRAS THAN A HOLLYWOOD EPIC "

I use Muc Off very good RRS TDV6 Gone but still around
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I suggest using an eastern european. 

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" WITH MORE EXTRAS THAN A HOLLYWOOD EPIC "

 RRS TDV6 Gone but still around
SL55 AMG
760Li Alpina
BMW 535D M Sport
BMW X6 XDrive35D
BMW 320D Coupe M Sport
And A Van For Rex!

WINNER - 2008's Idler Of The Year
WINNER - 2008's Comedian Of The Year
WINNER - 2008's Funniest Incident

I love boobies i love boobies i love boobies cuz i'm a big kid now! (Come on everybody sing with me you know the words!)

Yeah, I use the same method as Shmoogle. Fantastic results every time, or your money back guaranteed. Arctic Frost TDV6 SE. Aspen Leather, Cherry Wood, Privacy Glass, PTI, Tow Pack, Mudflaps, Tasmods, a new Fuelflap, a RRSport.co.uk umbrella in the boot & a RRSport.co.uk sticker on the rear glass.
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2009 Outstanding Contribution Award - Joint Runner Up
2009 'Tech-Head Of The Year' Award - Runner Up

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JayMann wrote:

I use Muc Off very good

I am having the same problem with my "winter" 19" wheels. Is the "Muc Off" you use the same as the Muc Off sold to clean bikes?

http://www.chainreactioncycles.com/Models.aspx?ModelID=520

Does it really work? I need some bike cleaner and have been looking at this stuff...if it will perform double duty...then it's worth it!  2006 Range Rover Sport TDV6 HSE, Java/Ebony/Cherry, Privacy, Sunroof, PTI, Premium Sound, SatNav, Cold Climate, Tow kit, CarStyle coded grill and vents, Tasmods, Stormers, JE Exhaust, Autobiography badge

I use some stuff bought from a cheap stuff in town on the Freelander. A good clean doesn't cost more than £2.50, thats for exterior shampoo, polish, interior cleaner and alloy cleaner  2002 Discovery Adventurer LE
1998 Freelander xedi
Ertl limited edition RRS model number 817

I used to have he same problem on my M5, landlord, it was dust/particles from the brake pads they were so hot that they would melt the lacquer on the alloy wheels and then sit there and look like black marks on the wheels. i cured it by having the lacquer stripped and the wheels polished, and left in a polished state, pain in the Ass keep polishing though, but it did cure it.

That might be your problem, just a thought some of my Previous cars
--------------------------------
P38 Range Rover Autobiography
RRS 2.7 HSE Silver
RRS TDV8 HSE silver
FFRR Vogue black
Disco3 HSE silver
RRS 2.7 HSE silver
RRS 3.0 HSE BALTI BLUE
______________________________
current vehicles
RRS 3.0 L494 Autobiography
Audi R8 V10 Spyder
AC Cobra
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Suzuki Jimney

Same problem on mine. Brake dust started to pit into the alloy after a few thousand miles. This is despite me cleaning the car every weekend; using P21s and none of this phosphoric acid stuff.

Went to the local LR dealer. They cleaned them (with acid), couldn't get all the dark dust out of the little pits either, but said LR probably wouldn't listen.

Worst wheels I've ever had.

Not happy. 

Beginning to make sense - the hot dust theory seems like it might be the reason. Certainly looks like the alloys are pitted. Its going into LR next week for the seats will mention it then ! MY10 TDV6 HSE, Alaska White, Ebony with Contrast, Park Heat, Paddle Shift, Privacy, Heated Steering Wheel, Extended & Premium Leather,

MY07 TDV6 HSE, Zermatt Silver, Gone

-----------------------------
1964 Austin Healey 3000

2007 LR Defender

2011 VW Tiguan R Line

Singletrack wrote:

Is the "Muc Off" you use the same as the Muc Off sold to clean bikes?

Yep if i have the time tomorrow I'll do a before and after pic for ya but the wheels aren't very dirty at the mo though  RRS TDV6 Gone but still around
SL55 AMG
760Li Alpina
BMW 535D M Sport
BMW X6 XDrive35D
BMW 320D Coupe M Sport
And A Van For Rex!

WINNER - 2008's Idler Of The Year
WINNER - 2008's Comedian Of The Year
WINNER - 2008's Funniest Incident

I love boobies i love boobies i love boobies cuz i'm a big kid now! (Come on everybody sing with me you know the words!)

Like MDP, I've used Wonder Wheels on the alloys and it brings 'em up a treat. Bit of hard work, perhaps, but the bad news is they go back to crap within a few thousand miles. Best keep that East Eurpoean handy!!!