Help Facebook app hidden cache??

[ntebis]

hi guys
these day low on space notification has come up and i was trying to discover what happens and i noticed that the facebook app was 10mb. I have previously checked my apps and it was 7 mb. On cyrket it says that it is 2 mb (http://www.cyrket.com/p/android/com.facebook.katana/). My question is can i clean this hidden cache from facebook and other apps (twitter also is 10 mb) without rooting.

My phone is
Asian HTC Desire 2.1 (Non Rooted)

 

[ntebis]

Solution found plz close

 

[SurfXombie]

Solution found plz close

Please do share?

 

[ntebis]

go to Settings--->Application---->Manage Applications----> Choose app-----> Clear Data

and then the cache will be deleted