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Discussion Starter #1 (Edited)
My 407 rain sensors weren't sensitive enough. Driving slow in light rain they didn't wipe enough, and even in heavy rain on the motorway they were only intermittent.
I had a new screen fitted a month or so after I bought the car last May, so I didn't know if it was the sensor itself at fault or the fitting.
Anyway, this only really came to my attention a few weeks ago when the weather got wetter - three months after the new screen. So I phoned AutoWindscreens, and they sent round a bloke...
He took off the cover, then prised off the silver side clips (I had had a look myself previously, but couldn't see how they came off, and didn't want to damage the screen)
He then pulled the sensor away from the screen - if has a reuseable gel pad on it - and thoroughly cleaned the glass before refitting the sensor. There was a bit of muck and possibly condensation on it.
Now when sprayed with water, the wipers work constantly, and even a fine mist spray will generate a single wipe.

So if you're getting a new screen fitted, make sure they clean and dry the glass where the sensor sticks. Shame the first fitter didn't, but credit to AutoWindscreens for coming back and sorting it even several months later.

And if your sensors seem not sensitive enough, all you need is a flat blade screwdriver and a piece of kitchen roll. 5 minute job.

I found the pic linked below, shows the right side silver tab pulled out a bit for removal.

http://www.eurospare.co.nz/car-parts/car-part-images/675_1_SSL17370.JPG
 

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Discussion Starter #4
5 minute job;
come on give us a stage by stage guide at least! LOL
I didn;t do it myself, I just watched. The only tool used was a flat blade screwdriver.

1. Prise of plastic cover over sensor
2. Prise open silver clips on either side
3. Pull sensor away from glass
4. Clean glass
5. Repeat in reverse (This might help.
)
 

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Discussion Starter #6 (Edited)
so is there nothing to clean on the sensor itself? just the glass?
That's all he did on mine... but there was obvious muck and condensation on the glass when he took the sensor away. The sensor itself is on a big flat siliconny pad, so there isn't really anything to clean. I guess if there was obvious contamination on it you could clean it a bit. I didn't get my hands on it, so iI don't know if its sticky or just a squidgy pad.
 

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Discussion Starter #7
Update

After a couple of weeks with minimal rain, the sensor stopped working!!

I took the back cover off when driving, and found that if I pushed it onto the screen, it worked... so I rolled a tissue into a ball and jammed it behind the sendor and put the cover back on, to press it onto the screen. Sensor working perfectly now. I guess that it might deteriorate over time, in which case I'll replace it with a bit of cloth or something...
 
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