Black powdery substance on rear window and deck

[Bobbafett]

Hi All, Anyone experience a black powder on the rear window and deck of their mach-e? It's not dirt, only appears on the rear of the car. Could this be brake dust? anyone else get this?

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[HuntingPudel]

I gather black dust on the back of my car. It is most visible when I am squeegeeing off the rear window, as it concentrates in the runoff process. It is worse on my Blazer (larger particles adhere to the hatch). The reason for the adherencce of the particles is the low pressure area caused during forward motion. This is why station wagons in the ‘60s and ‘70s had air deflectors positioned to blow air on the rear window, to reduce the amount of particulate collection and enhance rear visibility. ??

Oh, and the composition of the dust is just general road dust. Due to the shape of the car larger dirt particles don’t tend to want to stick to those surfaces, but the finer particles do. Among those smaller particles is worn tire rubber. ??

 

[Polar]

Hi All, Anyone experience a black powder on the rear window and deck of their mach-e? It's not dirt, only appears on the rear of the car. Could this be brake dust? anyone else get this?

Do you park inside or outside? Does your car get dewy in the mornings or has it rained recently?

With the shape of the MachE I collect pollen/dirt on my rear window and rear decklid. It’s always the dirtiest part of my car.

 

[Bobbafett]

I gather black dust on the back of my car. It is most visible when I am squeegeeing off the rear window, as it concentrates in the runoff process. It is worse on my Blazer (larger particles adhere to the hatch). The reason for the adherencce of the particles is the low pressure area caused during forward motion. This is why station wagons in the ‘60s and ‘70s had air deflectors positioned to blow air on the rear window, to reduce the amount of particulate collection and enhance rear visibility. ??

Oh, and the composition of the dust is just general road dust. Due to the shape of the car larger dirt particles don’t tend to want to stick to those surfaces, but the finer particles do. Among those smaller particles is worn tire rubber. ??
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[Bobbafett]

Thanks for the comment. Makes sense, my Mach is white so it seems like it’s always there. A small annoyance.?

 

[Bobbafett]

Do you park inside or outside? Does your car get dewy in the mornings or has it rained recently?

With the shape of the MachE I collect pollen/dirt on my rear window and rear decklid. It’s always the dirtiest part of my car.

I park in a garage, I just never saw this before and never owned a white car before. Thanks for the reply!

 

[RickMachE]

Owning a white car means it is always dirty. I only buy Ruby Red / Rapid Red vehicles.

 

[jsteach]

It is particulate fallout of everything imaginable. In some studies as much as 20% is for worn tires.
Here is one such article;
https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC5664766/

 

[Bobbafett]

Oh man....Another reason to develop hovercraft technology.

 

[PaulP]

Could this be brake dust?

This is my second white car and it is always dirty (I bought from the lot, so I took what was available then, it wasn't my first choice because of that). When it's clean, it's a nice color, but it's hard to keep clean. Talking about brake or rail dust, in a year or two, you will start to notice orange specks on the white paint of your car, caused by small metal particles landing on your car. I use Carpro's Iron X to remove them, it has the smell of a skunk but it works great.

 

[Motomax]

Owning a white car means it is always dirty. I only buy Ruby Red / Rapid Red vehicles.

I would have never thought of red as hiding dirt, usually that’s reserved for gray cars.
space white does a great job at blending in dirt with the gray tint. Just a couple feet away and you can’t even tell.

 

[Carsinmyblood]

Oh man....Another reason to develop hovercraft technology.

I think they're dustier.

....yea, I checked. dusty.

 

[HuntingPudel]

Owning a white car means it is always dirty. I only buy Ruby Red / Rapid Red vehicles.

Heh, my white cars never looked as dirty as my black ones. ??‍?

 

[Logal727]

The rear window gets dusty just looking at it, I’m always brushing it off.

 

[Polar]

The rear window gets dusty just looking at it, I’m always brushing it off.

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