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Draco is spot on, as usual. I have also had very good luck doing the following:
1) spraying electrical contact spray into the intermittent switch while vigorously working the switch back and forth.
2) the wiper stalk is very similar to the turn signal stalk, in that the contacts get bent and dirty. IIRC, the stalk can be re-bent and cleaned in situ.
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STONE
'88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended. 
Deny Everything; Admit Nothing; and Always Make Counter-accusations 
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