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Old 09-12-2016, 08:58 AM   #1
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Windshield Condensation/Reduced Vis

Does anyone have any ideas to prevent it? IE, for those mornings or at night when the dew point is high.

I bought a small, 12V plug in fan, pointed it at the windshield, and it didn't help. Not enough heat, or air flow to make difference.

I have heard there are some liquids/sprays that can be used. Snake oil?
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Old 09-12-2016, 09:06 AM   #2
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A bar of soap , or a cut potato marked across the inside and spread with a towel will work to stip some condensation.

Just like inside a scuba mask.

Spit works too but is hard for a large window.
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Old 09-12-2016, 09:26 AM   #3
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Hmmm, hadn't thought of that. We use diluted J&J baby shampoo in our scuba masks. Best (and cheapest) defogger, and I've tried many.
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Old 09-12-2016, 09:32 AM   #4
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A rag on a stick? That's what we use.


A fan helps a bit but you can buy a fan made for just this purpose that has a built in heating element. I think WM sells them or you could try an auto parts store or a truck stop.


http://www.westmarine.com/buy/cafram...fogger--389298
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Old 09-12-2016, 09:34 AM   #5
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Strange of strange. Windex. Spray on lightly. Helps reduce the surface tension of the humidity. But you have to find the right balance between too much and not enough.
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Old 09-12-2016, 09:54 AM   #6
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I use a hairdryer.
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Old 09-12-2016, 09:55 AM   #7
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I turn on the inverter and run a EVA Dry dehumidifier as soon as I start the engine in the morning. Seems to work pretty good.

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Old 09-12-2016, 11:09 AM   #8
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Thanks for the feedback. My wife was using the rag on the boat hook yesterday morning at 4 am. The condensation comes back pretty quick though. Its an open boat, hard top, but aft canvas, so I am not enclosed like a typical trawler so that adds to the problem, and why a heat source wont work.
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Old 09-12-2016, 11:36 AM   #9
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Quote:
Originally Posted by Fletcher500 View Post
Thanks for the feedback. My wife was using the rag on the boat hook yesterday morning at 4 am. The condensation comes back pretty quick though. Its an open boat, hard top, but aft canvas, so I am not enclosed like a typical trawler so that adds to the problem, and why a heat source wont work.
The only way to avoid it then is to equalize the temp and humidity on both sides of the glass. The best way to do that is with air exchange. Hard to do if you are sleeping on board as our bodies kick off a lot of moisture and heat.

I would go with a high quality chamois type cloth to do the wiping to avoid much streaking which would hurt visibility later in the day when the sun comes out.
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Old 09-12-2016, 11:46 AM   #10
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You could try a portable 12v window defogger like this:

Sea Dog Ceramic 12 Volt Windshield Heater - Defogger
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Old 09-12-2016, 11:53 AM   #11
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shaving cream.I use it on mirrors, but would work on a window. Needs occasional recoating.
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Old 09-12-2016, 12:04 PM   #12
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You might try the 12v stick on foil like in cars (aftermarket stuff like from JC Whitney).

Usually cheap enough, low power and canning it if it doesn't work is what it is....
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Old 09-12-2016, 12:31 PM   #13
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Rain-X?
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Old 09-12-2016, 12:56 PM   #14
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Have you tried this Rain-X product? I never have tried it, but have tried something similar for a glass shower door that seemed to work OK for a while. Not sure how it effective it would be long-term.


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Old 09-12-2016, 01:13 PM   #15
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Joy soap -Wipe on with paper towel and remove with same.

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Old 09-12-2016, 03:29 PM   #16
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Originally Posted by Lepke View Post
shaving cream.I use it on mirrors, but would work on a window. Needs occasional recoating.
I thought this was crazy when I first heard it months ago, but it works. Apparently shaving cream has ingredients similar to products designed for this.
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Old 09-12-2016, 03:45 PM   #17
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I have tried a portable, 12V heater, and it didn't work.


Thanks for the comments about the various liquids. I will give it a try.
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Old 09-12-2016, 05:11 PM   #18
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Use a squeegee to remove most of the condensation then a big hand full of dry paper towels followed by warm air from a 12volt window defogger. It may take more than one hand full of dry paper towels but the squeegee is key to remove most of the water.
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