def clean_irrelevant_index(df, col_name, clean_item):
    """
    Utility function to remove irrelevant index features across a feature.
    --------------------
    Params:
        df : pandas DataFrame in question
        col_name : name of column in question
        clean_item : value to be dropped.
    --------------------
    Return:
        pandas Dataframe
    
    """
    # scan for specific item
    item = [clean_item]
    
    # single out item we are interested in
    drop_item = df[df[col_name].isin(item)]
    
    # drop our featured item index-wise
    df.drop(drop_item.index, axis=0, inplace=True)
    
    
    return df.head()
    pass