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[DAW]

Verbose but easy to follow...

    // Clear up existing scale if we need to by removing any labels
    int i,j;
    int totalSubViews = [[self.view subviews] count];
    for (i=0,j=0; i < totalSubViews; i++ ) 
    {
        if ([[[self.view subviews] objectAtIndex:j] isKindOfClass:[UILabel class]])
        {
            UILabel *thisLabel = [[self.view subviews] objectAtIndex:j];
            NSLog (@"Removing %@",thisLabel.text);
            [thisLabel removeFromSuperview];
        }
        else
            j++;
    }