def var_name_clean(line_in):
    """
    Removes #, $ and PVM_ from line_in, where line in is a string from a Bruker parameter list file.
    :param line_in: input string
    :return: output string cleaned from #, $ and PVM_
    """
    line_out = line_in.replace('#', '').replace('$', '').replace('PVM_', ''
        ).strip()
    return line_out
