If you still have store return or replace policy so have them repaire or replace it. If the policy expired then try to get Fuji to fix it.
Unless you have proper tools and a very good understanding on how the lens put together, I would not recommend opening it as you'll void the warranty.
I would assume you blow it with your mouth or compressed air which is a big mistake when cleaning lens area, next time use a vacuum cleaner.
A Vacuum Cleaner (http://www.mendapump.com/MendaCatalog/Vacuums/ServiceVacuum/35846/)
design for electronics cost about $250 but you can by a portable dirt devil (http://www.bestbuy.com/site/olspage.jsp?skuId=8724348&type=product&id=1200703057808)
for less than $50 and doing a little bit of modification on the spout and it'll works just fine. together with a soft, chemical-free and dry lint-free cloth. Large vacuum works fine too as long as you're careful not getting parts suck up.