If your car is like a MKV, the situation is that you can have auto sense that is adjustable to the amount of water on the sensor, ie. spotting, mist, drizzle, rain - and this is adjusted on the stalk top switch.
With this there is not a need for variable speed intermittent.
The auto sense setting is one click up from the off position on the stalk.
I hope that makes sense.
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