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Discussion Starter · #1 ·
hey,

Just wondering if anyone else living in cold/snowy areas are getting this issue. The bottom window of the trunk which is on the back just above the license plate seems to get so dirty I can't see through it anymore. I've gotten out of the car and used snow to clean it up and not even an hour later it was all dirty again.

anyone else have that issue or is my neighborhood extra dirty? lol
 

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mine gets dirty also. i usually wipe it clean and its good for a few days. also when i fill up at the gas station i use the squeegee and the cleaning fluid on it and that holds up a bit better.
Good call! But how often do we hit the gas station in our "Gas Guzzling" CR-Z's? I go about every two to three weeks it seems like. Ain't it great! :thumbsup:
 

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Due to the aerodynamics of the car, yeah, dirt collects on the rear end badly.

I've been using this stuff, Opti-Clean, that cleans it and leaves a layer of polymers on the car.. The polymers are hydrophobic so repel water and grime as much as possible.. And also they aren't really meant to bond w. the paint like a sealant, so it's easy to wipe away.. I'm not explaining it well, but basically dirt just falls off the car.
I've been seriously impressed.
There are other similar products from most of the modern polymer sealant companies....

-- edit -- actually, thinking about it, I also have a layer of the polymer sealant on the car.. Opti-seal in my case, but Zaino and the other polymer sealant brands are similar. They all shed water and dirt very well.. So if you haven't used one of them, I'd recommend it. This is the first car Ive ever used these polymer sealants on, and like I said a sec ago.... Ive been very impressed! dirt doesnt stick.
 

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i have the factory spoiler, and mine still gets dirty. i can see well enough to use it for reverse, etc. my car is garage kept tho, so that helps.... and i cant say if mine is better/worse than one w/o a spoiler...
 

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I think the aerodynamics of our car is the problem with dirty rear. Its not just the window, it gets dirty where licence plate goes. Iv been noticing hatches get dirty in the rear fast.From my understanding, All the dirt and airflow that comes through bottom of the car turbulates and hits the rear window area and then leaves with the flow of wind thats coming fromthe top of the car.
 

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Dirty Back Window

The reason the back window is getting dirty so fast is because of what is called the station wagon effect. Water and dirt comes up from underneath the rear of the car and coils around to stick to the verticle surfaces (such as the small window). If you have ever had an SUV you may have noticed that the back of the vehicle always accumulated the most dirt. Same thing. The only solution is to have a spoiler on the rear which has a space between it and the body. This type of design grabs air and directs it down to counteract the air coming up from underneath the rear of the car. So far I have not seen this type of design offered. I installed a factory spoiler on my car but it is flush mounted so it is of no help. I am toying with the idea of remounting the spoiler a bit off the car but the thing is so flimsy that I think air pressure beneath it might just destroy it!
 

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The reason the back window is getting dirty so fast is because of what is called the station wagon effect. Water and dirt comes up from underneath the rear of the car and coils around to stick to the verticle surfaces (such as the small window). If you have ever had an SUV you may have noticed that the back of the vehicle always accumulated the most dirt. Same thing. The only solution is to have a spoiler on the rear which has a space between it and the body. This type of design grabs air and directs it down to counteract the air coming up from underneath the rear of the car. So far I have not seen this type of design offered. I installed a factory spoiler on my car but it is flush mounted so it is of no help. I am toying with the idea of remounting the spoiler a bit off the car but the thing is so flimsy that I think air pressure beneath it might just destroy it!
Mugen spoiler?
 
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