It's usually 2 motors I believe - the wiring can corrode so if you're lucky you can unplug it, clean it all up and you're good to go. If not there's a modified part from Audi which includes a different plug which doesn't let water corrode the contacts!
My headlight washers were playing up regularly but since having the wiring cleaned up they've been perfect 
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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