def _clean_lc(lc):
    """ Perform Lightkurve operations on object.

    Performes basic cleaning of a light curve, removing nans, outliers,
    median filtering etc.

    Parameters
    ----------
    lc : Lightkurve.LightCurve instance
        Lightkurve object to be cleaned

    Returns
    -------
    lc : Lightkurve.LightCurve instance
        The cleaned Lightkurve object
        
    """
    lc = lc.remove_nans().normalize().flatten().remove_outliers()
    return lc
