I've got a loan Rapid Spaceback at the moment and that's worse than the Citigo [emoji15]

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I will loose this competition when it comes to the rear. After I placed air guides back there, the whole rear is clean all the way down to the bumper...

I'd say all cars tends to collect dirt for the back. There must be some kind of vacuum behind the car when it's moving. Hatchback just looks more awful, because rear window gets dirty too.

 

This. It affects hatchbacks particularly. Or at least, flatter backed cars. SUVs, hatches, city cars. 

This is the reason that hatchbacks and SUVs and such have rear window wipers while the saloons and coupe body shapes do not have rear wipers. 

Edited 4 February, 201511 yr by Camlep

Merry Christmas from Finland

 

Liking the blue flag on the roof !!

It's a bus stop sign actually. I'm happy it's not on the roof, but on the side of the road.

Seems to me the flatter the back window, the quicker the dirt collects.

Try to move a cube across water surface and watch the turbulence behind it. Drag will poor down the rear of this short car with dirt in no time. A coupé will not collect dirt due to better air flow and less drag with less turbulence. Maybe something as simple as vortex generators will force the airflow more straight backwards and reduce dirt? Just tested spoiler which guides airflow from the roof and downwards over the rear windscreen - works fine too.

 

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