Here’s some news that will not make GWU alums proud of their alma mater: the Pi Kappa Alpha fraternity apparently used abrasive laundry detergent to lubricate a Slip-n-Slide at a charity event this weekend, sending at least one sorority member to the hospital with chemical burns and severe skin irritation. After the event, university officials sent out an email warning that “Possible symptoms from the laundry detergent could also include shortness of breath, throat…