TESTING PROCESS
WE COATED OUR car’s windscreen with a solution of dirt and allowed it to dry. Then we diluted each of our products to a 1:1 ratio of water to screenwash (except the Auto Glym which, due to its high concentration, was diluted to 1:9), and used a spray bottle to apply five squirts, before swiping across the screen with a wiper blade. We then inspected the screen for grime removal and absence of streaks, before verifying our results with four more squirts and another wipe.