Rear wiper motor going slow

[GOOGIE]

Hi My rear wiper motor is getting slower and slower. Would appreciate any suggestions to fix. TIA 

[haelewyn]

Try to find all the connections all the way up to the fusebox and see nothing is corroded. 
If that doesn't do the trick, let a mechanic look into it and if necessary, replace the wiper motor.
Altough my feeling is that this will probably not be necessary.

 

[stewr7]

I had something similar, and it got to the point where the wiper would get stuck half way and I would have to free it by hand. I used an old toothbrush and some WD-40 to try and clean corrosion and dirt around the spindle. I also adjusted the nut under the plastic spindle cover and that seems to have done the trick for me (for now at least!).