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Rear window getting dirty


kelper

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2 hours ago, RicardoM said:

A wind tunnel is used for a lot more than that. That is why you're missing the logic in my comment.

There was no logic in your comment.
In designing the best possible bus with max room for passengers they have a flat back that get's filthy, is that poor design?

You are clutching at straws now or has your account been hacked?

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22 hours ago, Sad555 said:

Wonder if somebody from Scandinavia or Eastern Europe can give a solution to this problem as I think it gets quite cold there and they may also have had this issue (not that I’ve ever seen it posted before).......ps I drove a van for well over 30 years with only wing mirrors (not heated)for rear view,I’m just trying  to remember how I managed!

To avoid snow to stick to my windscreen, in very cold weather with drifting snow, I reduce the temperature in the cabin. Use this method when crossing the moutains, often in convoys, when stopping is absolutely not recommended.

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3 hours ago, Urrell said:

You are clutching at straws now or has your account been hacked?

No. It's that I always address the root of the problem by going after the guilty part when I'm having an issue. If you believe that Skoda design team has not even the responsibility to suggest alternative effective solutions (is it so hard to ask them?) then by all means go ahead and pay from your own money for all kind of gizmos to correct a long time known design problem on other similar design cars. So let's agree that you don't want to understand my point. See that I give you the benefit of a doubt that you can understand common sense technical matters. It's obvious you don't want anyone else to be right. Let's agree to disagree.

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13 hours ago, kelper said:

I like this!  How cold do you let the cabin get?  Presumably, when the windscreen gets very cold the snow just bounces off?

Depends on wind speed and own speed. The higher wind speed across the windscreen the higher cabin temp is possible. But quite often you are standing at a safe area for the convoy to build up. This is the time for you to lower the cabin temp and, as you say, let the snow bounce off. When the convoy start moving the windscreen must be dry and cold. Even the wipers must be dry, and never attempt to use the windscreen cleaner. This will only wet the windscreen surface and make the snow stick.

 

If outside temp is not too low, one could go the other way round by producing maximum heat towards the windcreen. This will, if you are lucky, melt the snow continuosly.

You may find you have to use large amounts of windscreen cleaner which should be rated at least -20C.
But if this method fails during your drive through the snowdrifts, then you are in deep sh**.

 

Always remember warm clothes.

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13 hours ago, RicardoM said:

(1) then by all means go ahead and pay from your own money for all kind of gizmos to correct a long time known design problem on other similar design cars.

(2) So let's agree that you don't want to understand my point. See that I give you the benefit of a doubt that you can understand common sense technical matters.


(1) I don't have a problem to sort, Skoda have put a wiper and washer on the rear to enable me to see any traffic etc behind.
(2) I do not understand your point. I CAN understand technical matters very well and if I wanted a sloping back with better keep clean properties I would have bought something like a Qashqai not the Yeti.
I see you have a Mini Countryman Cooper All4 in your signature line that looks much the same as the Yeti,
Unless you own a Yeti you will never understand.

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This is a fundamental outcome of moving a large object through the air.  The last car I can remember having that DIDN’T get spray on the rear window was a saloon shape. My XC60 has a more sloping rear - it gets dirty. My SEAT Leon is a hatchback - it gets dirty.  There’s no sloppy design here, no conspiracy, just the normal compromises you have when designing anything: you can’t have the practical benefits of a squared off back without the aerodynamic penalty.  As stated above, there’s a wiper fitted by way of recognising and partially solving the issue.

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1 hour ago, kelper said:

Can you recommend a brand of screen wash?

As the VW one has come off offer I use this, £3:50 from Tesco and has won several car magazine group tests.
 

IDShot_540x540[1].jpg

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175GDY, 

 

Vehicles stuck in the UK for hours or overnight in the snow are usually on Motorways and major trunk roads, 

usually south of Perth,  and sometimes on the A9 north of Perth,

and often those in the Central Belt of Scotland and further south are not in that extreme conditions.

In low temperatures, but they are told to keep the engine running, keep warm, certainly not reduce the cabin temperature.

*People switching off engines are often those that set out in winter without enough fuel, and likely washer fluid.*

 

Interesting you keep talking about snow.

Often it has nothing to do with snow or snowing when the dirty rear screen is an issue, the snow means clearing your glass / rear screen is easy.

Just low temperatures, slush, thawing snowy roads covered in salt from 'gritting' and drying on brine from roads being kicked up, 

and once you have done a few hundred miles of motorways where the weather and roads can be very different even 10 *oc difference withing 50 miles of travel 

it is when you start running out of washer fluid even though you started with a full washer bottle.

 

The temps do not even need to be low to be driving where the rear window gets easily caked.

So snow little to do with it, 

where it is snowing in the UK the temps are not often much below -4*oC.

Usually above that. & Air Temps and road temps are very different things.

 

Blizzard like conditions in the hills or mountains in the UK being very different from Blizzard like on a Motorway or Dual Carriageway where that comes to a halt.

In UK Mountain passes and Blizzard conditions this usually mean Snow Gates get closed, and cars escorted out.

Ploughs - Gritters leading the way.

 

Beautiful day in the Scottish mountains, snow not an issue, filthy windows and cars can be, much washer fluid required, 

freezing nipples / fluid not an issue, just take extra 'liquid / H2o / Washer Fluid.

http://lecht.co.uk 

http://ski-glenshee.co.uk/Webcam 

 

You want to see out the rear for those tailgating you ready to jump you to get your space behind the car in front, 

you are all going the same way and all get there except when some plonker crashes, 

black top roads mostly, and just the stoor / salt kicked up and covering your rear screen, and side windows, and mirrors...

Glenshee 10th Feb 15 037.JPG

Glenshee 10th Feb 15 021.JPG

Glenshee 10th Feb 15 033.JPG

Glenshee 10th Feb 15 045.JPG

100_5339.JPG

Edited by AwaoffSki
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AwaoffSki: Responding to a question raised here.
Just sharing my experience from driving in the worst (winter)weather conditions you can have here in Norway.

But conditions as you describe are difficult to handle, and demands the use of washer fluids -and lots of it.
I tend to use fluids not too concentrated, this is bad for the paint. But never use fluids dilluted to freezing temp over -10C for summer use and -15C for winter use in my area. Moutain crossing in the winter: at least -25C.
Don't bother trying to keep the rear windscreen clean, always seems to collect some oily smear the wiper won't cope with.

Nice pics BTW

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Well the UK sometimes get -15*oc measured at weather stations, near that this year,

and yes there has been -27*oC at Braemar and maybe elsewhere in the past. There was winters from hell 'in the past'.

 

There seems to be some UK members driving in the UK that are in a parallel universe of Sub Arctic conditions. 

Or just not preparing their vehicles.

 

PS

People have cars for many years, this concentrated washer fluid bad for paint is a myth really.

As De-Icer or pre-icer bad for the rubber. 

Salt / Sodium on the roads is not Paint or Rubber friendly or even concrete friendly.

 

 

 

Edited by AwaoffSki
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My rear jet never froze.  But the front jets frequently did.  I'm sure this was down to wind chill.  When air passes over water evaporative cooling will keep cooling it until it reaches the dew point.  This is how the whirly gig type hygrometer measures humidity.  The dry bulb stays at ambient and the wet bulb drops to the dew point temp.

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Lets bring on the Science.  Someone will know it without googling.

Lets not confuse humans / animals 'Wind Chill',  the feeling of being cold, temperature / windspeed,

and the other evaporation of liquids, freezing points etc.

 

As to Washer Fluid in the bottle or pipe or in the nipple, 

the H2o frozen on the outside might just have Water / H20 blocking it.

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In case this is useful - I compared the cost and freeze protection for the top performers.  Any screenwash that did not protect at -20 was excluded.

 

  Cost per litre diluted to give -9 protection mix for -20 Cost per litre diluted to give -20 protection
       
Granville Sub Zero -20 £0.40 100% £0.89
Granville Sub Zero -30 £0.47 65% £0.91
Comma Xstream £0.80 39% £1.25
Prestone concentrate £1.75 85% £1.49
SONAX NanoPro Xtreme £1.05 50% £1.57
Comma All Seasons £1.99 82% £1.63
Sonax ready to use £1.20 100% £2.40
Decosol Excel £2.76 86% £4.75
Normfest Frostex £3.46 46% £4.77
Decosol All Season/Dual action £4.47 62% £5.54

 

I made a spreadsheet and graphed the various dilutions against freeze protection.  It was pretty linear.  I used the graph to calculate mix ratios.

screenwash.xlsx

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Lidl's good Continental Wind Screen wash when you can get it.

Stuff those prices per litre, i go through Imperial Gallons of Windscreen washer in a year. 

(Sometimes to clear my vehicles screen / rear screen but mostly to tell tailgaters they are too close in adverse conditions.)

 

Edited by AwaoffSki
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9 minutes ago, AwaoffSki said:

Lidl's good Continental Wind Screen wash when you can get it.

Stuff those prices per litre, i go through Imperial Gallons of Windscreen washer in a year. 

(Sometimes to clear my vehicles screen / rear screen but mostly to tell tailgaters they are too close in adverse conditions.)

 

So, you should be even more concerned by prices!  I agree with you about tailgaters!  I would like a separate screenwash filled with something sticky, just to annoy them!

 

They all drive Audis!  VW drivers are a close second.

 

I wrote to Lidl and they can't tell me when they might sell screenwash again.  Just go to hisltd.co.uk and buy some Granville screen wash.  They charge £12.75 for delivery up to the remotest parts of mainland Scotland.

 

 

 

 

 

 

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29 minutes ago, ben4012 said:

It's just dirt. Here are some solutions, pun intended. 

Wash it off.

Leave it there.

Stay at home.

Use your door mirrors. 

It's a legal requirement for the windows to be clear.   On Scottish roads in winter it's possible to run out of screenwash.  Your solutions are too weak to be helpful!:biggrin:

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33 minutes ago, kelper said:

It's a legal requirement for the windows to be clear. 

Does the rear window come into that if the door mirrors are clear?

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4 minutes ago, Urrell said:

Does the rear window come into that if the door mirrors are clear?

The Highway Code clearly states that "windows and windscreens MUST be kept clean and free of obstructions to vision"

 

That 'MUST' makes it a legal requirement in the UK.

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1 hour ago, kelper said:

It's a legal requirement for the windows to be clear.   On Scottish roads in winter it's possible to run out of screenwash.  Your solutions are too weak to be helpful!:biggrin:

 

It is also a legal requirement to keep your washers working effectively, hence running out of screen wash can be interpreted as an offence:

 

Quote

(6)  Every wiper and washer fitted in accordance with this regulation shall at all times while a vehicle is being used on a road be maintained in efficient working order and be properly adjusted. 

 

On the clear windows thing, C&U says:

 

Quote

(3)  All glass or other transparent material fitted to a motor vehicle shall be maintained in such condition that it does not obscure the vision of the driver while the vehicle is being driven on a road. 

 

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