I found that on my '91 E34 the most consistently successful method is to
first to turn on wipers and turn them off *before* they complete the
first sweep. I then wait until the interval has passed and turn them on.
At least for my car it works.
All cars do not have an adjustable delay for the wipers, my car is among
those without the adjustment. If you can adjust the delay, you do it by
setting the wiper switch to ON for a wipe, then OFF, this starts a timer.
When you set the swtich to ON again, this sets the delay time.
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