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When is the iPhone cache application cleared?

I am working on an application that allows users to record voice (among other things) in the application’s Documents folder. But when I record the voice, I write to the application’s cache directory, and then after the user says “OK, save this”, then I go to him in the “Documents” folder. So far, it all works. But if I try to delete the data file in the cache, or when I try to move it, I have problems.

So my question is: will I just leave the data in the cache so that iOS processes it or do I need to manually delete the files in the cache. If so, how will I do it. This is the code that I still have (which does not work)

    NSFileManager *fm = [NSFileManager defaultManager];
    NSString *directory = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
    NSError *error = nil;
    BOOL success = [fm removeItemAtPath:[NSString stringWithFormat:@"%@%@", directory, currentEntry.audioFileURL] error:&error];
    if (!success || error) {
        // it failed.
        NSLog(@"it failed to delete!!! %@ %@", error, [error userInfo]);
    } else {
        NSLog(@"Deleted... yipee... !!!");
    }
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