Sory Mario, but I misunderstood.

All color films can use the Photo Flo 200 + Formalin route, but modern C41 films can use the new Final Rinse. The reason I continue to mention the Formalin stabilizer is that in some places, the final rinse is not available or, OTOH, Formalin is banned. So, that is my answer.

E6 films of all type and age require some sort of Formalin treatment. The 3 bath kids do not supply it. You can treat films that need it after the fact, but not too much after the fact. IDK what the time period is.