I have been trying to remover drivers side wiper arm from 98 f150 Lariat but it will not budge. I sprayed Blaster on it and tried prying and using a gear puller but it won't move. Was trying to use a couple of screw drivers to pry it off but afraid that I was going to break the plastic on the shroud, any ideas?

 

slightly push down on the arm side to relieve spring tension on the bottom of it. While pulling up in a swift motion