There are fasteners that hold the windshield cowling on along with a strip of rubber that keeps water from running into the compartment. The windshield wipers also go thru this cowling. I need to service the cabin filter and clear out the builtup debris and then clean the drain outlets after I pull out the cowling. How do I undo these fasteners or screws. I tried unscrewing them (did not work). I tried to pull them out but did not want to destroy the screws ot the holder as I need to use them to replace the cowl. I have attached a picture of the screws.