Correct tool for removing wiper arms

Hi,



I have a 2004 1.2 16v Clio Dynamique.



I have a problem with the leak in the driver side footwell. I suspect it is to do with a blockage beneath the wipers but I can't get the wiper arms off no matter how hard I try.



Is this the correct tool to buy?

http://ift.tt/1gg6cbX



Any further advice would be much appreciated!



Andy