https://autocarehq.com/are-traffic-film-removers-bad-for-car-paint-and-waxes/Tfr contains chemicals lile salt and mild acids which is why it's not good fer washing body work. It wont take oft the laqour but it does attack it. That's why I dislike it.
So, as I said if used carefully, properly and followed by a wax, they are OK. But not to be used as a matter of routine.