Rain X and Rain Sensing? - Mercedes-Benz Forum

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post #1 of 22 (permalink) Old 08-08-2006, 02:55 PM Thread Starter
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Question Rain X and Rain Sensing?

For years I have used Rain X on my glass on all my vehicles. My wifes new c280 4M has the rain sensing wipers. Can I still apply Rain X or will it mess up this type of wipers operation?

Thanks for all your help...
Jim in WV
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post #2 of 22 (permalink) Old 08-08-2006, 05:40 PM
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Why not? In some small drizzle and RainX she might not want the wipers to come on. All it takes is a flip of the switch.
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post #3 of 22 (permalink) Old 08-08-2006, 07:13 PM
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I just bought some small pouches of RainX windshield solvent additive, but am hesitant to add it to the MB fluid (I have 2 other old daily beaters that I experiment around with). For one thing, I have no idea what the MB dealer has in the resevoir, but I plan to ask them on my next visit.

I don't think RainX would interfere with the rain-sensing wipers; I believe they respond to water droplets hitting a sensor within the windshield glass itself. Just because RainX lets them glide off, they should still sense the pressure/sound of the rain hitting it.

BTW, where are you in WV? I bought my Benz from Smith in Charleston and live in Huntington. Also, "herd72" sounds familiar - I spent a few years at Marshall in the 70s and early 80s.

Last edited by Musikmann; 08-08-2006 at 07:19 PM.
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post #4 of 22 (permalink) Old 08-08-2006, 07:16 PM
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Quote:
Originally Posted by Musikmann
I just bought some small pouches of RainX windshield solvent additive, but was hesitant to add it to the MB fluid (I have 2 other old daily beaters that I experiment around with).

I don't think this would interfere with the rain-sendor wipers; I believe they respond to water droplets hitting a sensor within the windshield glass itself.

BTW, where are you in WV? I bought my Benz from Smith in Charleston and live in Huntington. Also, "herd72" sounds familiar - I spent a few years at Marshall in the 70s and early 80s.
Rain sensors, AFAIK, work by detecting the light refractions when the water droplets hit the sensor.

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post #5 of 22 (permalink) Old 08-08-2006, 07:28 PM
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Quote:
Originally Posted by Musikmann
I just bought some small pouches of RainX windshield solvent additive, but am hesitant to add it to the MB fluid .


DROP THAT STUFF INTO GARBAGE CAN IMMEDIATELY!

I didn't experience that myself but reports say, that the additive sprays gummy and waxy residue all over the car.
Will cost you $$$$$$$$$$$$$$ to get it cleaned after.
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post #6 of 22 (permalink) Old 08-08-2006, 07:31 PM
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Question Refractive index

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Originally Posted by asianml
Rain sensors, AFAIK, work by detecting the light refractions when the water droplets hit the sensor.
So what are we supposed to conclude from this? You might making what might be a simple problem into a complicated one.

IF you are correct, then RainX (or anything else that thickens or adds a coating to the glass) might change the windshield's refractive index, and this might present a problem with using RainX and rain-sensing wipers.

It's been way too long since I have had optics in college, so maybe someone who has all the facts will make sense of all this, and provide an educated answer.

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post #7 of 22 (permalink) Old 08-08-2006, 07:37 PM
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Lightbulb Oops!

Quote:
Originally Posted by Kajtek1
DROP THAT STUFF INTO GARBAGE CAN IMMEDIATELY!

I didn't experience that myself but reports say, that the additive sprays gummy and waxy residue all over the car.
Will cost you $$$$$$$$$$$$$$ to get it cleaned after.
Thanks for the tip Kajtek1 - I guess it's a good thing that they were on closeout for less than $1.00 each. The AutoZone guy said it was discontinued because it wasn't selling - hmmm, now I think we have the answer as to why.

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post #8 of 22 (permalink) Old 08-08-2006, 07:56 PM Thread Starter
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Now I am really confused . . .

and I majored in Chemistry and Physics. Maybe one of my old profs can shed some light on the refraction issue (Bad Pun!). Musikmann - I am in Barboursville and also bought mine from Smith. It was a very good buying experience - although they still owe me a set of keys! I would definitely steer clear of those little packs though. Rain -X has a new product called windshield wax that is easier to remove but lasts almost as long as the original stuff. Glad to talk to someone from H'Town. I was at MU from 1969-1972. I also went to WVU and UNC for graduate school and teach and coach in Cabell Co.

Jim in WV
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post #9 of 22 (permalink) Old 08-08-2006, 07:58 PM
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Quote:
Originally Posted by Musikmann
So what are we supposed to conclude from this? You might making what might be a simple problem into a complicated one.

IF you are correct, then RainX (or anything else that thickens or adds a coating to the glass) might change the windshield's refractive index, and this might present a problem with using RainX and rain-sensing wipers.

It's been way too long since I have had optics in college, so maybe someone who has all the facts will make sense of all this, and provide an educated answer.
Well, I'm not really sure if it's true, it's just what I read a while back on the forums from a seemingly knowledgable person.

At this point, all I have to say is STFF about the rain sensor..........?

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post #10 of 22 (permalink) Old 08-08-2006, 08:16 PM
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Arrow herd72

HA! Ask Ralph Oberly about anything to do with optics, I think he's still on the active faculty here.

GREAT buying experience here too, and I think you can count on the quality of a CPO used Benz bought from Smith.

Thanks for the RainX tip, you have a lot of experience using it - so I will do.

We're about the same age, I SHOULD have graduated from college in '73 but took until '77 for my lousy BA - oh well, I didn't need THIS much for what I do (sales). I was both an undergraduate and graduate student at MU - no degrees from there though.

I live in Huntington, about 5 minutes from downtown, and am an HHS graduate (69).

Congratulations on your Mercedes!
Musikmann
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