Solutions
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Fireblade954's post in A3 Sportback Rear Wiper leaking, fix it or delete it? was marked as the answerupdate: stripped the original motor and put o rings where the water was escaping, didn't fix it. bought a chinese copy motor which fixed the place it was leaking from but water was coming out of where the little white clip pops onto the motor. Tried siliconing it, didn't work so removed the metal clip on the tube the holds the clip on, and the clip and attached the tube directly to the motor, and it's fixed for less than 30 quid.