Why don't my Volkswagen Golf's automatic windscreen wipers work in drizzle?

The intermittent front wipers on my 2007 Volkswagen Golf do not work. They are activated by a rain sensor. I have been to my local Volkswagen dealer three times and they claim that they work fine, pouring water over the windscreen to demonstrate this. However, on a drizzly night the wipers never work when positioned to intermittent. I don't know what to do next.

Asked on 27 August 2010 by westers

Answered by Honest John
There's not enough rain on the "drizzly night". The sensitivity of rain sensors can vary enormously.
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