Fluoride Free RustGo effectively removes rust stains from fabric without the use of Hydrofluoric Acid. Although not as fast-acting as Original RustGo, Fluoride Free RustGo is significantly safer for the worker. So if your procedures can accommodate a few extra minutes, you should consider using the safer yet still effective alternative, Fluoride Free RustGo. (Although Fluoride Free RustGo is relatively safe, you should still read the SDS and follow the appropriate precautions, including the use of appropriate PPE.)