I'm no expert but have a look here
http://type-r-owners.co.uk/forums/showthread.php?75950-Filter-Problem-EP3-(&highlight=Cleaning+filter
Also have a search on here 'cleaning air filter'
Hope this helps
If it is the standard paper filter you won't be able to clean it. Yougjj just have to buy another one.
Cleaning is for aftermarket only filter elements.