I flew on an EZY 737 in May last year that needed de-icing after a particularly unseasonal frost. The de-icing fluid on top of the wing looked sticky and gooky to me. On the take off roll it slowly spread backwards until it reached the trailing edge, and dripped off into the airflow. Interestingly it was still glooping off the fairings and the wingtip lightning conductors by the time we approached Bristol some fifty minutes later.