windshield wiper motor

The car wash brushes may have snagged your wiper arms and caused damage to the wiper linkages , spindles or motor assembly. You would have to remove the wiper arms, turn on the wiper motor see if you hear the motor operate when you turn on the wiper switch. If you hear the wiper motor operate chances are the motor is OK and the linkage has problems. There is no way to access the damage without disassemble or partial disassemble of the wiper mechanism. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. and get an online repair manual subscription.