can someone tell me how i can FORCE "clear data" on my dialer storage?

[mushedroom#AC]

hi,

can anyone show me how i can force a clear data on my dialer storage?

it's for a
android 2.3 gingerbread / HTC EVO / sprint

when i go to applications and try to do it, it will not let me force stop
and "clear data" is not an option to click.

please help