Thin films of superconducting (TMTSF)(2)ClO4 (where TMTSF = tetramethyltetraselenafulvalene) have been prepared by simply immersing crystals of (TMTSF)(2)PF6 in dichloromethane solutions of (Bu4N+-ClO4-)-Bu-n. The mechanism of this unprecedented, highly efficient, ion-exchange process is examined in this communication, while the resistance and magnetoresistance of these layers are studied as a function of temperature. The morphologies of the films are studied by energy dispersive spectrometry.